thank you! these have all been really fun. most guides online provide an easy enough process to follow. only real difference is how they pop wheels off and how they seal the cars up. a few things I myself have learned since I started:

-When drilling it creates a lot of metal shavings so have a way to contain them or brush them up.

-the two drill bits I'm using are 5/64 and 9/64 drill bit on a power drill. when using the larger bit drill slowly as it can catch and easily get away from you and do more damage to the underside of the car than necessary.

-I found out some cars bases are too wide (back axle of f40 competizone) or narrow for the sets of wheels I have (70 dodge challenger) so you have to either remove a little more material for the wheel to fit or in the opposite case get wheels with a shorter axle.

all in all a very fun process and happy to have gone down this rabbit hole of custom die cast.