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Seal the wood well, so it won't pick up odors.
If you are thinking of making it out of wood, it sounds like just a box. There are all sorts of ways to make a wooden box, and I'm sure there are tons of plans out there too. I'd make it out of a thin plywood so it won't be that heavy. Reinforce the corners with solid wood. The joinery there depends on the tools and skills you have, but screws holding the plywood to the solid wood in the corners is probably the easiest. But you may be going for a different look than plywood panels, so do what you like.
The pedal would be just like a see-saw with the back of the see-saw pushing up on a metal rod that lifts the lid. So you would want to have a couple solid wood runners on the sides underneath the thing to lift it up and give some clearance for the pedal. The pedal fulcrum could also attach to those same side runners.
I'd suggest finding some plastic bins and using them as liners and just build the wood structure around them.
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