I made this DIY drawer system. It's mounted on the airline rails on the cargo floor. If I take the cargo wall out (4 screws) I can make it longer with that plate on top and create a flat surface to sleep. Need to shift the chairs in forward position. But you get a bed approximately from 1,9 meter x 1,2 meter + some extra space left and right. So enough for a short trip and not using the RTT, or ideal for stealth sleeping.
I can get a small fridge in it + food, kitchen and other stuff for a weekend away.
Still needs some painting to finalize.
I can also use it to store my Makita work-gear in during business days, to go to a site for depannage or montage.
Also received this week the Black Sheep Molle system for the interior panels left and right. Still need to mount this, probably a weekend job. I will post some photo's when done.