turns out i didn't really need to wait for the plywood to dry, because the lower sheets stayed fairly dry in the rain. so i put a bottom on my drawer, hooray. it kinda needs finishing but i'm lazy and kinda just want to put stuff in there to get it out of the way
i spend a buncha time wondering if i should get 3.6mm (9/64") or 5.5mm (7/32") plywood. went with the former. it's a little wibbly in the middle but i can always add a little bracing later