Ok, I made further progress as I had missed an area I could get to for triggering the first lever. I've got the lifts moving at the bottom right of the screen now but there's a lever enclosed in walls that I can't figure out how to open up. I'm assuming that's what I need to trigger to get the over lifts moving?
I'm in two minds as to whether you should give out too much help, though, as I think the game is supposed to be about trying things out and experimenting so I can understand if you don't want to give too much away. I would like to complete it before voting ends though. PM me if you don't mind helping further.