This is so simple it's complicated, I almost overlooked coming to the board and asking for ideas... but the more I think about it I would love to see how others would approach this.

The end product is a 20" x 20" x 3/4" piece of plywood (or MDF) that breaks into 2 pieces 10x20 each. When assembled it needs to be solid. When in 2 pieces it needs to be benign (i.e. no sharp edges) The final use is a table top for a portable display unit. It will be removed, stowed and then used again at shows.

My first thought was to use a piano hinge so they fold open, then add a small lip under them like a table apron. This is not the best solution because they fold into one piece.

My other thought was to do opposing rabbits so they would lap onto each other. Then place a small fastener of somekind on the bottom. That leaves a little too much flex.

Ideas welcomed!

Robert