lil red express build up?

well i am looking at building up a truck and found a love for the lil red express trucks but there are none for sale so is there a way to build my own from a normal 1/2 ton truck? the main thing is trying to find a short bed truck, i have found one but its a 84 dodge 1/2 ton and am wondering if it will work with the older lil red express parts?
http://www.buysell.com/userphotos/0001124773/11162004_110077136.jpg
http://www.hubcapcafe.com/i/2001/cars4kids/dodg7901.JPG

also what is the difference in length between the long bed extended cab and short bed regualr cab dodge trucks also this is going to be done as a performace truck (sort of) so what should i get?

1979 DODGE S/C , supercab, v8, auto. (what does S/C mean?)
also doesn't have a bed. $800
1984 DODGE 1/2 TON , shortbox, 318 4 bbl, 4 sp. std.
complete $1950

S/C in this case means super-cab. A four door. With a full-size box, these trucks are pretty long...

You could just take a normal shortbox pickup and put a stepside box on it. It shouldn't be hard for you.

A super-cab truck with a stepside box would be a good idea, I've never seen something like that before. Would be one of a kind...

A custom lil red express with a crew cab would be an awesome one-off cutom . . . if you do this be sure and post pictures!