I've heard some good things about this S10 conversion kit as far as ease and quality of the installation, I think I'm gonna order one for my '51 Chev and put it on an S10 chassis as well. I realize they only list to 1941 but they have a picture of a 1940 using the universal swap kit. Even if you don't buy it they have some info on wheelbase and such as well as a cutaway pic to give you some idea of what's needed to put it on the S10.
http://www.e-zchassisswaps.com/index.htm
Like they said the body looks great and I've seen lots of truck boxes going for cheap around here from guys building the Rat Rods using only the cab. As far as fixing the pinholes someone here gave me the idea of using a small piece of copper sheet held in some vice grips. I bend it to fit in behind the hole then hit it with the Mig, it takes some of the heat and keeps it from burning a big hole. Works great.
Keep plugging away, I love seeing these old trucks.
Sean
Thank you Roger. .
Another little bird