Wow......sounds complicated LOL
Glad to hear you want to start the worm farm and compost, welcome to "the other side".
My initial thoughts:
worms don't migrate back and forth, they migrate to where food is and is why you stack the containers one at a time. this way when you have one container of castings you can lure them all below to a fresh one with food. if you continued to add to the same container they would never migrate and you would not get your casting harvest...that make sense
i'm sobre now so its hard for me LOL i know you understand rolln LOL
second thought, you want your compost bin to provide a warm moist humid atmosphere to aid in breaking down the compost, so you arent' going to want to vent it to much.
I think you should def build the compost bin out of wood outside and then just use the tupper ware for worm bin. You are going to want wormbin mobile. Keep in mind, to keep the worms where you want them, you need to provide a good environment for them.
You compost bin will not walk away and quit on you in the middle of the night. You little crawler friends will if you leave the container in direct sun, under 60-65 temps as well. You need to be able to control their environment is what im trying to type here. I keep my box in the garage as often as possilbe. Fly's and other bugs will enter your box outside as well infesting your box with insects. Try to use a black or dark container as well. the worms will try to stay away from the light. This is another good way to separate. you can pour out all contents on sheet or blanket and continually keep spreading some castings away, the worms will keep working to the deepest part of the pile to avoid light.
Keep it simple, and indoors if possible and your worms will thrive giving you the "black" gold. I know how muchyou like "green" rolln, but you'll love black as well.
peace