Sweet looking truck you got there.
I am on the other side of the spectrum... I can get an engine and transmission bolted together, but I can't do paint or body work.
A quick rundown of my 1940 gmc planned build...
1957 gmc 302 6 cylinder built for about 225 hp
1994-1997 Dodge NV4500 transmission
IMCA modified f*rd 9 inch rear with 12 inch disc brakes using stock 6 on 5.5 lug pattern
12 inch front disc brakes
16 inch stock artillery wheels that have been widened to 7 inches.
I do plan to use the stock frame and suspension. The front axle will be swapped with the front axle of a 1941-1954 to allow me to use disc brakes. The axle swap is a "bolt on" upgrade.
Good luck to you!