I used a push-to-open/close magnetic cabinet door catch that is almost weightless with which I also resolved the handle issue. Now it is ready for edge sealing (epoxy) and filling. I will bond the hinge permanently to the door and screw it to the cover for removal, if needed. All the items I plan to store in them can be exposed to water without damage so I did not work at water-sealing the spaces. Since the foam will not absorb water, I just drilled a 1/8” drain hole in the lowest point next to the fuselage.

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