This must be the slowest build on the forum, back on it though, the box is now insulated and framed out with bunks shower stall, bathroom, plus t&g wall boards are up on the bunk side.
Excuse the clutter too many projects going at once 😁

So what was the reason for notching it making it overhang the cab? Thought about doing this with a shipping container and my reason would be due to length of the rig I have. How many inches of spray insulation did you go with? Also I suggest a hybrid insulation so as to break thermal bridging.