Looks like thats the way to go, kill two birds with one stone; cut the back out of my cab and slap a cab slice from this other one I have just collecting dust, and at the same time have to shorten the bed for everything to fit, I'll finally get that short bed I been wanting!!! I don't know why I didn't think of this myself?? Thanks you two.
(I'm just kidding, I would never cut up a cab like that!!)