I'm looking at a lot of idea sources for the truck. The RV industry, tiny houses and big-sleeper trucks. The usable space is small for such a large heavy vehicle and doesn't make sense in some ways but there is enough room for two people with all their stuff. I would love to build in a couple of slide-outs but it would be beyond my engineering capabilities. The biggest extension will come at the back; with a 8 x 8 foot fold-up deck. With an awning and canvas side screens; this will be the primary lounge area.
Here are some pictures of the fold away two-burner hob that I made; which will also relocate to the outside kitchen and slide out BBQ.