So I debated posting here or on the foamie section my build journal. It's a cutaway van chassis which I built a plywood deck upon and then assembled/glued a 7*14*6.5' box made of 4" used Polystyrene.
Check it out in the foamie section or click the link
viewtopic.php?f=55&t=71251
If you think it might be of use or interest to you.
It's built in the overland style, or more specifically,
overland lite.