Between work experience and school he has spent every spare minute "hundreds of hours" designing and making the 37 tonne hydraulic wood splitter, which he intends to sell once "he's finished splitting next winter's wood" for his parents, Anne-Maree and Pete Nikolaison.
The hardest part wasn't actually building the towable piece of equipment but planning it and putting it down on paper for the NCEA accreditation, Thomas said.
"It wasn't too difficult to do ... the hassle was just fitting it out along the way and all the paperwork and designing involved.
"I knew what I wanted to do but it was just the showing how I got there that was the hardest part of it."
Thomas got a lot of support along the way from his parents helping fund materials bought off the internet to technical support from engineer Dave Hignett to the Toolshed and Gary Wishnowsky from ENZED who "did a lot" to help him.
"It was a real challenge," he said. "I had to try different things to get there. A lot of logic ... but I got there in the end."
As for Thomas' parents, they are both extremely proud of their son.
"We are very proud and excited for him. It's just incredible what he has made."