"But an old injury started creeping up, I'm not getting any younger, and it was time to get off the tools.
"I've always been interested in tech but I don't enjoy being limited and clerical office jobs were not the thing for me and I thought building design could be good.
"There's a lot of satisfaction in thinking up solutions to problems around people's biggest asset — their home — and then using tech to create those solutions."
At 44 years old, and with a family to help support, Whena last year left the security of a job he knew and enjoyed for the unknowns of fulltime study at the Universal College of Learning in Palmerston North, working towards his third tertiary qualification — an architectural technician diploma.
Whena was surprised to find the building industry software, Revit, he trained on had a similar interface to the software he used at the wānanga on his animation diploma all those years ago.
"It helped give me a really good transition into my studies."
Now, with his diploma close to completion, Whena is nervous and excited about the future.
He last month launched Paraparaumu-based Pou Architecture alongside his two co-founders – his former boss Johnnie Saunders of Kāpiti construction company NZ Proud and architectural designer Esekia Faiga.
Johnnie said having a former builder on the drafting computer gave the firm a massive advantage.
"You just don't get that experience or expertise anywhere else, it's such an asset."
It's been many years since Whena's diploma at Te Wānanga o Raukawa but the knowledge he gained there and the curiosity for learning it inspired have taken him far.