Joe my gmc is a 1/2 not a 3/4 i have seen a bunch of gmc 1/2 that are long bed

I was thinking finding a donor s10 truck that was complete. S10s 4x4 frame are a little wider in front and about the same in the rear. Dumb [censored] me had a complete s10 truck but had to get rid of it do to a move. It would be easy( for me) to modify the s10 frame for the 38 frame to fit.
Some of this is self dought, I have not done any kind of automotive or body work in probably 10 years because of work, I am retired now so I have plenty of time. I have experience in fabricating parts and modifications, been around the automotive industry for 50 years because of my step dad( he was an automotive machinest). Plus was also looking for opinions and guidance


1938 Gmc 1/2 ton