A madcap uncle made his young nephew's dream come true by building a roller coaster in his back garden - based on the 11-year-old's drawings.
Leigh Downing, 47, and his son Charlie, 20, used the sketches made by his nephew Calden Ashley to construct the 230ft-long big dipper.
Leigh and Charlie used plastic pipes for the rails and old bits of scrap metal and wood to make the frame of the coaster.
The inventive duo even used an old wooden chopping board as the seat of the ride which circles Leigh's back garden in Llandyrnog, Wales.
They built it as a surprise for Calden who was fed-up after being unable to see his friends over the summer holidays as a result of lockdown restrictions.
Former engineer Leigh said: "Calden has been roller coaster mad for as long as I can remember.
Pictures of the week: August 9 - 15
Pictures of the week: August 9 - 15
A man in protective face mask is seen walking during the holiday season at usually very crowded Westminster Bridge as London encourages internal tourism after global Coronavirus lockdown drastically shrunk international tourism - London, England, August 13, 2020. Very important for British GDP tourist sector has shrunk significantly during the coronavirus lockdown. Despite England relaxing its lockdown there is only a fraction of the usual number of tourists in the capital. (Photo by Dominika Zarzycka/NurPhoto via Getty Images)
NEWCASTLE UPON TYNE, ENGLAND - AUGUST 13: Musician's from Sam Fender's band perform at Virgin Money Unity Arena on August 13, 2020 in Newcastle upon Tyne, England. Sam Fender is the first to perform at the socially distanced music venue. (Photo by Ian Forsyth/Getty Images)
PLYMOUTH, ENGLAND - AUGUST 13: Member of Old Plymouthian and Mannameadians Rugby Club train together in a large group for the first time since lockdown at King George V playing fields on August 13, 2020 in Plymouth, England. Stage C of the return to play Rugby Protocol is now in operation as coronavirus restrictions are eased. (Photo by Dan Mullan/Getty Images)
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YORK, ENGLAND - AUGUST 12: Actor Chris Hannon from the Park Bench Theatre performs Samuel Beckett’s 'First Love' during an open air play in a socially distanced covid secure space in Rowntree Park on August 12, 2020 in York, England. As coronavirus lockdown restrictions are eased in many areas, the theatre and the arts sectors begin to re-start their businesses. 'First Love' is a short story by Samuel Beckett, written in 1946 and first published in its original French version in 1970 and, in Beckett's English translation, in 1973. The Park Bench Theatre season is being presented by Engine House Theatre. (Photo by Ian Forsyth/Getty Images)
Assistant Head Gardener, Nick Delves at the National Trust's Nymans Gardens in West Sussex, where the forecast of rain is good news for the gardeners caring for the 60 metres of summer borders which are reliant on rainfall and harvested rainwater as they reach their peak. Picture date: Wednesday August 12, 2020. Yellow weather warnings for severe thunderstorms remain in place for large swathes of the UK, with temperatures expected to remain in the mid-30s. See PA story WEATHER Hot. Photo credit should read: Stefan Rousseau/PA Wire
Flooding at Queen Victoria Hospital car park, in Kirkcaldy, Fife, Scotland. Thunderstorm warnings are still current for most of the UK on Wednesday, while high temperatures are forecast again for many parts of England.
People enjoy the hot weather as they take a punt trip along the River Cam in Cambridge, England Tuesday Aug. 11, 2020. After days of scorching temperatures, large swathes of the UK could be hit by severe thunderstorms this week. (Joe Giddens/PA via AP)
A woman sunbathes in a London park, Tuesday, Aug. 11, 2020. After days of clear skies and high temperatures, large swathes of the UK could be hit by severe thunderstorms later this week, if predictions are correct.(AP Photo/Kirsty Wigglesworth)
The sun rises over fishing boats at anchor in the sea off of Selsey in West Sussex. (Photo by Andrew Matthews/PA Images via Getty Images)
SOUTHEND-ON-SEA, ENGLAND AUGUST 11: A traffic warden wearing a face mask checks a parked vehicle along the promenade on August 11, 2020 in Southend on Sea, England. Parts of the UK remain in the grip of a Summer heatwave that has seen temperatures rise above 30 degrees in much of the country. (Photo by John Keeble/Getty Images)
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Maintenance work on the UK's first Dutch-style roundabout, which prioritises cyclists and pedestrians over motorists, and has been forced to close for three nights due to a car crash that happened the day before its opening ceremony.
A man and woman, both wearing protective face masks, walk out of a shop on Oxford Street, London, as the UK continues to recover from the coronavirus pandemic.
LONDON, ENGLAND - AUGUST 11: The London Eye is lit up in red as part of the #WeMakeEvents 'Throw Us a Line Campaign' on August 11, 2020 in London, England. Venues across the UK turn their lights red to represent the industry being on "red alert" and highlight the issues the live events sector are facing during the ongoing coronavirus pandemic. (Photo by Chris Jackson/Getty Images)
Two-year old Jessica Sanderson amongst the sunflower fields at Vine House Farm near Baston, England, Monday Aug. 10, 2020. (Joe Giddens/PA via AP)
The sun rises behind Blyth East Pier Lighthouse in Northumberland. (Photo by Owen Humphreys/PA Images via Getty Images)
Pupils arrive at Kelso High School on the Scottish Borders as schools in Scotland start reopening on Tuesday amid concerns about the safety of returning to the classroom during the coronavirus pandemic. (Photo by Owen Humphreys/PA Images via Getty Images)
Britain's Prime Minister Boris Johnson takes part in archery during a visit to the Premier Education Summer Camp at Sacred Heart of Mary Girl's School, Upminster, England, Monday Aug. 10, 2020, to see the steps they are taking to be COVID secure ahead of children returning in September. (Lucy Young/Pool via AP)
A protester selects a placard at Times Square during the Black lives matter protest.
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An elderly man is seen riding his rickshaw on Waterloo Bridge during summer tourism season as London encourages internal tourism after global Coronavirus lockdown drastically shrunk international tourism in London, England, August 10, 2020. Central London at this time of the year is usually full of tourists, cars and rickshaws but amid Covid-19 pandemic most traditional tourist businesses struggle to find clients. (Photo by Dominika Zarzycka/NurPhoto via Getty Images)
Young men of Shubzskate group pose to be photographed in a landmark Southbank skate park as London encourages internal tourism after global Coronavirus lockdown drastically shrunk international tourism in London, England, August 10, 2020. While England introduces a policy of obligatory protective face masks in closed public spaces, some people choose to use masks outdoors too. (Photo by Dominika Zarzycka/NurPhoto via Getty Images)
Myleene Klass arrives at the Global Radio Studios in London. (Photo by Brett Cove / SOPA Images/Sipa USA)
A demonstrator shouts slogans on a megaphone during a Black lives Matter protest outside Scotland Yard.
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A group of people thought to be migrants crossing The Channel in a small boat headed in the direction of Dover, Kent. (Photo by Gareth Fuller/PA Images via Getty Images)
Tourists are seen walking on London Bridge at south bank of Thames river as London encourages internal tourism after global Coronavirus lockdown drastically shrunk international tourism - London, England, August 9, 2020. While England introduces a policy of obligatory protective face masks in closed public spaces, some people choose to use masks outdoors too. (Photo by Dominika Zarzycka/NurPhoto via Getty Images)
KILMARNOCK, SCOTLAND - AUGUST 09: Ryan Christie of Celtic takes a free kick during the Scottish Premier League match between Kilmarnock and Celtic at Rugby Park on August 09, 2020 in Kilmarnock, Scotland. (Photo by Ian MacNicol/Getty Images)
Red Bull driver Max Verstappen of the Netherlands celebrates after winning the 70th Anniversary Formula One Grand Prix at the Silverstone circuit, Silverstone, England, Sunday, Aug. 9, 2020. (Bryn Lennon, Pool via AP)
Mother and daughter walk through a plantation at the Pick you Own farm.
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Home Secretary Priti Patel in Dover, the day after she appointed Dan O�Mahoney as the Clandestine Channel Threat Commander - a new role leading the UK�s response to tackling illegal attempts to reach the UK - who will be tasked with making the route unviable for small boat crossings.
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"Even before he was tall enough to ride, he was designing them on a computer.
"It all started a couple of years ago when I had an operation and was off work for a couple of months.
"I gave Calden a wooden marble rollercoaster kit I had when I was a child.
"He was so thrilled with it.
"My son Charlie built him a small wooden rollercoaster that he could ride.
"He was absolutely ecstatic with the end result, but a couple of years on had got a little bored with it.
"We hatched this latest idea during lockdown.
"We built it with a wooden frame for the structure, PVC pipe for the rails, and 462 wooden bearers that we mounted the rails on, all of which Charlie cut and filed a 40mm profile in. We did it all in eight days."
Charlie, who passed his maths GCSE when he was 11-years-old and skipped his A Levels to go straight to university to study maths and science, is a hobby mechanic.
Leigh, who has a background in engineering, added: "We said to Calden, you do the design. He designed it from start to finish including every twist, turn and bunny hop.
"We had to rein in his expectations. At first we thought we could do the drop two metres. We built the car and put it down and then went to three metres.
"He loved it when he saw it but he had been involved in making it so he saw it as it came along."
Leigh said when it came to making the car, there was "lots of trial and error".
He added: "We had many injured hay bales as the car dismounted the tracks with them on board.
"We resolved this with discs cut out of a chopping board mounted to the bottom of the side wheels.
"We also did hay bales and human trials. You could say Simon, Calden's step dad, was the guinea pig.
"He insisted on riding it first to make sure it was safe, followed by my mother Wendy who's disabled and we had to lift her into the car."
Leigh said the build has brought Charlie, Calden and himself together.
He added: "It was good fun. We worked well as a team and had lots of laughs along the way, and I feel we did something absolutely amazing.
"Calden was very cautious at first. We got him parked at the top and just let go and oh my god - we were exhausted. It is human powered to get to the top. Then you climb in the car and off you go.
"It is too frightening for me. I have had a go and Charlie has had a couple of goes.
"After months of lockdown and Calden not able to see friends, as soon as they said two families from two households could meet, we said we would built it.
"They really didn't believe me when I told them I was building a roller coaster until I showed them the video.
"Our next plan is a full steel roller coaster with a corkscrew and a loop which, of course, will rely on Charlie's maths degree coupled with Calden's roller coaster designs."