Edit: I didn't go up thread very far...Granda is that you?
I had a similar set up in my T5, I don't have any pics to hand as I'm away from my laptop but my grandad is a carpenter and a genius.
The gist of it was, it folded up to the wall of the van. A strut along the length of the side on joists and the wheel well which was screwed in. Then a hinged bed supported by folding out legs came down, very sturdy.
So it folded flat to the wall when not in use and came down half way when in use. We then made a second half which can be removed completely which made it a double bed with no space for bikes when needs be.
Annoying I cant get a photo for ya but it was a wonderful solution.