Here is a recent YouTube showing the install for the minivan camper.  I encourage you to watch this so as to understand conceptually the thought process behind the whole minivan camper construction.   I have received numerous requests to sell “plans” for this .  Before going there, I think it best to first understand the design philosophy so you can make your own build your own.   I will follow this up with the actual construction information.   Also follow along by going to the DIY Projects page.