"I guess the first advice I'd give is don't do what lots of people do and tear out the stock interior parts. So many people do that and then try sticking wood to every surface leading to both a heavier van and a cobbled together mess. Leave every thing in, remove the seats, and build a modular setup that fits in that space, compliments the interior, and most importantly bolts down securely to stock seat bolt locations."
I completely agree with this advice. don't tear down the interior.
In my case i cut off third seat in the last row and fitted box instead, removed flip-out seat and reused frame as base for stove box.
slightly lifted middle row, added piece of plywood under back row cushions and i got flat bed.
this way i can use mine as normal passenger carrier, if i need it, or i can drop in a few things, like back door tent, gas shower, food, and i am all set to go for a few days
the only thing that i would not do at all is placing cooker inside the van.
mine is placed next to the door, so i cook with slide door open.
if i had it inside, i would have sticky and stinky interior.
all fumes from frying, all humid from boiling - all of this will stay on the walls and ceiling
so either cooker next to the door, or slide out cooker