Hi , I've recently bought a single fold out bed ottoman. I am planning on upholstering it and in the process want to convert the single top to a folding half top to make it have a headboard when the bed is out.
Basically I need to remove the fabric and foam , cut the wood top in half and add a few hinges before adding cut foam back on and upholstering. (See drawings).
Does anyone have any suggestions to how heavy duty the hinges , is 100mm overkill? (or how many needed) as it could be sat on while closed.
Would I need to add a sliver of wood under the hinge screws to secure it more?

