The “flap shelves” could even start a bit below the horizontal plane, for the sake of collecting condensate…
But here is a risk, that wood-bits at the periphery might strangle (brake) the movement upward. The outer cylindrical surface may need a cylindrical cover-plate moving up with the flap, and avoiding the wood-bits to have ANY contact with the “silo”-wall.
Also, if both flaps are allowed to start bending upward all together, they can lock each another, by compressing the wood lots against each another!
This will be avoided, if only one at a time is allowed to rise up to ~60 degrees – what the moving “periphery plates” allow until reaching the center-line.
This 60 degree position could automatically release the other one to start pushing upwards.
Just a scenario “fantasy”…