Jimmy Flintstone does the 1938 GMC cab, # NB303 which is now on sale for $12 His castings are traditionally a "little thick", and I'm told by a good friend of his, that the reason is so that they do not warp when left setting on a shelf, waiting to be built, for super long periods of time. I've built several different things using his bodies, and have NEVER had one that was warped, the usual plan of action tho, is to take a barrel sanding disc and "remove" a bunch of the excess from the inside of the piece. Small price to pay for some really decent resin bodies that are affordable.
DJ