That's my favorite old Chevy cab. Why not use the front end, too? It's got character, and it looks to be in pretty good shape. "Z"ing the frame ahead of the firewall is hard to make look good, going straight up the firewall so it looks like it grew out of the 'wall might be best.
A tiny flatdeck and 15" dual wheels would be cool!
Alberta safety inspection might be a bitch, too.