Frame experts...little help please

Hey guys, Im building a 35 ford RPU. I am building it out of a daully truck. Anyway, my Q for you guys is: can I just use the big frame, cut the back off, then just put in a kickup with a smaller suspension set up, or is that just plain old*****n dumb? Thanks for the help guys.

 

Im no expert but YES that will work..........

 

thanks man, your help is appreciated.