I need to make a cupboard door. Size is 990mm x 915mm with a maximum thickness of 37mm. It will be to replace two existing hollow doors on a large bedroom cupboard. The idea in having a single door is so that a TV can be mounted on it.
The door fits into a conventional door frame as installed by the builders so is flush with the front of the frame.

Initially I thought about making a hollow door with lap joints at the corners and a vertical rib to take the TV mount and then cover it with MDF which will be painted. Then I wondered if I was over complicating things and I should just use a sheet of 18mm MDF. MDF would be about 12Kg and the TV about 5Kg so heavy but not massively so. The problem with this solution would be the hinges - I don't like the idea of screwing into the edge of the MDF. Googling shows that other people either do it without a problem or set dowels into the edge and then screw into these. So anyone have any thoughts?

Peter.