Steps to making my truck a unibody

Well i just got a daily driver so i plan on dooring my mightymax cutting off the top and lowering the front window shaving the doors shut etc... i just need to know if someone can give me some tips when i go to unibody it like support ideas etc... (oh im also going to make the truck a walkthrough) i just want to make sure when i unibody it it will not crack after i get it painted etc... any help / pics would help alot thanks