in general weight is an issue they tend to use 4mm ply but you should opt for 6 or9 with 12 for horizontal surfaces
if its a seated area you should consider 12mm for side pannels and 18mm for horizontal then you wont need a frame for support
fixing to the bodywork can be a pain is it lined or ribbed[stantions] bodywork!!!!!
try and plan for things to have 2 or more uses like table for example fits between benches to make a sleeping area
doors should be sliding or not protrude to far when open
finger holes or very small round knobs are preferable
solid bolts or latches are preferable to hold doors shut
need any more ideas just shout
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