Are the top pieces cut D?
If not and they are/can be taller than the space needed, you can just glue a 1x2 to the back of the skin, and then rest that on top of the existing 1x2 frame. The whole piece would just lift off and drop on.
Awesome idea.
I would add one extra piece to that. Make the piece you add to the outside skin, a L so that it traps the top in and supports it completely. Then maybe some small magnets at the bottom to hold the bottom in tight.
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