Making a fold down back camper van seat

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taylor47
Making a fold down back camper van seat

Hi Guys,

I'm trying to figure out how to put a bench in the back of my campervan which folds down to make the bed.  I found some hinges in a Reimo catalogue but I'm a bit unsure what to put them onto - do you reckon just making a box out of wood for the seat base would work OK?  Or does the frame need to be metal to be strong enough?

Any thoughts appreciated....