Here's my take on the subject. You'll build a better car with more experience. More seat time will give you a better idea on what it takes to build a better race car.
Buy a car you don't like, run it into the ground, learn the ropes. When you wad up the car you don't like, you care less than when you wad up a car you spent years developing.
Then build a car you really like, and go slower because you don't want to wad it up.
Then park it, buy another car you hate and drive the snot out of it because you don't care.