I went through the same headache when re-assembling my 46. With all those weird pieces, supports etc etc, but not to worry the thing goes together better than most 40s vehicles. Just keep in mind that the radiator support is the key piece for the entire front end.
There are some good factory drawings that show the front clip exploded, which should help. Search this site

It's easier to get forgiveness than permission!
1946 1/2-Ton Chevy
1953 Chevy 3/4-ton Factory Stakebed