Flush trap opening flat

Use a toggle joint hinge.
Toggle Joint Hinge.jpg
 
Awesome suggestions, thanks so much! I wish I had seen those Rose Brand hinges earlier - those would have been perfect.

We wound up going with piano hinges mounted on the edge of the door and the trap opening. Worked pretty well; with the luaun "planks" added to the tops hid the hinges well enough to not be a trip hazard or interfere with the door opening. Had to scrap the original design for the doors themselves because plywood doesn't like a zillion little screws in it on edge. Imagine that. Went with solid 2x8's pegged together. Heavier, but rigid enough to not need additional framing.
 

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