huzzah! no more ass gap when i sleep back here—and no more tools going missing down the hole either. need to make a couple minor adjustments, but it's essentially done!
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shored up the bottom a bit with these 2x2 pieces that the supports screw into, and even drilled countersinks so the screws sit nice and cozy
and then, because i forgot that the fabric here actually covers part of the hinge, i had to reshape the notches a little bit to accommodate that. now it's a perfect fit, and i am a little more confident with the jigsaw than i was! all that's left is to maybe paint it black, or if i'm feeling really adventurous, maybe upholster it sometime.