What? It's the most simple premise there is. It's literally what I do with my cars, improve where I can, when I can. You don't need a ton of money to have fun with these cars, they're simple to work on, and most parts you'll need are still available. It can't get any more basic.
I like it when they do have a simple budget friendly build. Most of the budget programs are gone. Iron Resurrection and Kingdig are cool but the average joe can't afford them. It's the same thing with racing it's pretty much for the rich.