These are a couple of 1:32 builds from earlier this year.
Chassis are mostly 3/64 - 1/16 brass rod with a little flat brass added.
The engines I cast from some NASCAR Snap-Tite kits. I added seat backs to some driver figures, & cast them.
The 38 Chevy mod started life as a diecast . I cast the body from that, then "slightly modified" it to suit.

I cast the '40 Ford body from a Shotgun Dave slosh cast-off Harry gave me.
Then Me, the Dremel & some Bondo finished it up.
I print my decals on a $50 ink jet & spray with Ace Hardware clear enamel when dry.

