"It was a teenage dream - but it took me to my 50s before I could reach it."
Mr Flett built his Mustang up from "a bucket of bolts" into mint condition.
"Would I sell it? Never," he said.
"When you build it yourself, it's different. How could I sell it?"
Mr Flett was among a bevy of like-minded people with similar stories at the event, which attracted plenty of interest from car owners and non-car owners.
Car owners were asked to park from 8am before the event opened to the public from 10am. By 8.10am, the domain was "chocka".
Mr Flett said the annual event was popular among other regional car clubs. Clubs travelled from across the North Island, including Auckland and Taranaki, Mr Flett said.
"We do push the family atmosphere. It's not just the bloke and the Mustang. The kids are a big part of it, too."
Mr Flett said there was increasing interest from people who did not necessarily own a classic car. Several people had requested the use of the cars for weddings.
Last year up to 4000 people visited the show.
The club annually makes a donation to a local charity with proceeds from the event. The club will make a donation to Waipuna Hospice this year.