I saw an interesting concept another site and thought it was worthy of another look here  "I envisioned the whole stage being a huge toilet where you saw only the top portion, seat, lid and tank. The toilet was so large that it becomes the stage and the show is played-out on top of it and on top of the tank at various levels. With the action of a huge flush handle the seat and lid would come down to close and rise to open. This was an imagined “Main Curtain” of sorts. There might even be a trap door for actors to exit the stage from the “bowl area” as if they were being flushed down the bowl."  Credit to Bil the Acct Commentator and Visionary.

Thanks Tech (and all) Started building last week and generally, ours is very similar to what you have there.  Thanks again.