HI,
the Amigo, Rodeo and Pup 4x4 share the same front frame section, but the amigo and rodeo have different wheelbases then the Pups (short and longbed). The rad support mounts and the first and second set of cab mounts are the same on the Amigo Rodeo and Pups 4x2 and 4x4 trucks. isuzu made ONE floor pan, with the exception of trans tunnel sizes and shifter location, for the 3 vehicles to keep costs low. Front the front doors forward are the same also,, except the amigo fenders and bumper ends. A truck cab on an Amigo frame, VERY INTERESTING idea. Kudos to you on that. Im doing a wide body Rodeo with an Amigo back again, my first one i never finished, but im converting the front frame clip to a 2wd truck frame so i can lower it.
Ron