Awesome stuff going on here. Looks great!!! What are the circular things on the sides 3/4 of the way up? Some sort of vent? I'm still looking at adding some sort of fresh air vent/fan to mine somewhere.
They are 4" ports that I used for a swamp cooler inlet and exhaust. Used a 5 gallon bucke "figjam" design for burning man the last two years. Worked pretty well. Now I have a fan wired in inbetween the van wall and the plywood to blow outside air in. Pretty sure both will be getting obsoleted tho once i put rear windows in.