re: Mounting board

A good jig Dutchy. I think there are as many names for this as there are styles of them. I've seen several you tubes for making the perfect square clamping jig, board, table, corner, and most have a solid 90 corner, and on the open side use either solid pieces that are smaller corners, and clamped or screwed into place, or often an open configuration where the use of wedges is used to exert the closing pressure. Any and all of them can work, if in fact they maintain a good square corner, and most of them make you feel like you have grown extra hands. The more parts that are in play, the more helpful they seem to be.

I had never thought to use a metal corner. I do know you will remake the ones using a wooden corner, it seems after several uses the corners weaken when made of wood, and start to suffer at keeping 90*. Usually build time is fairly quick, so if it isn't square anymore, just remake it.