go and find a 3+3 CC Cab and the short bed mount the bed on frame cut the frame infront of the bed/behind the cab and mount the cab on the front end of the frame and peice togther a section to mounth between the frames
this is the short vertion might not be the real direction to but someone might be better to explain it then i am
for frame cuts look up some of the short bed cc builds
or look here if you can make it shorter you can make it longer lol
http://73-87.com/7387garage/chassis_...lwb_to_swb.htm