Greetings from new Zealand. We have a 7-seater fully trimmed interior NV200. The rear seats unfortunately do not fold all the way down. You could sleep in the back, but might not be very comfortable. If you give me an email address, I could take photos for you. Kind regards, Gary
With the front passenger seat folded flat and a small chock lifting under the middle rear seats tilt catch & folded flat.
I use a few pieces of ply to form a flat base over the gaps and can sleep very well with a garden seat cushan
I have also inserted ply inside the seat backs by just undoing the zips