hinges

Hi there! I'm designing a set where I'd like certain walls to pivot and I could use some advise.The idea is to have four walls making a cross, with the downstage 2 turning about 180 degrees each, and the upstage two stationary and braced/bolted into the stage behind. My thought of how to do...

I am doing a production and for it the director wants the hinges to be made squeaky. We originally had sound effects for it however there have been many problems in timing it correctly. The type of hinges I have are large piano hinges, as they are on 16' doors, does anyone have any suggestions...