I appear to be missing the additional fold out panel that extends the roof bed so you can actually lie down.
Whilst I can measure the gap etc and drop in some thick MDF, I'm not convinced that a slightly overweight adult wouldn't bend it, perhaps dumping them on top of the people below

If anyone can help, it would be nice to know or see the exact dimensions and more importantly, what sort of material (and thickness) Westfalia used on the original?
I've got the brackets that i guess used to be attached to it, but some clues as to how it folded would also be gratefull, presumably it folded back over itself (180degrees)?
Thanks in advance for any help.
Cheers
Tim