that chair animation is awesome. I'm doing a trap door in the floor. wont see or feel a thing. then you push a secret button and it pops open. 300 pound magnetic lock holds it shut and no handle, so aside from a crow bar, there's no way to force it open by hand.
I love being creative. the hidden door ways in closets and stuff isn't very hard. the sliding compartments in the walls is a little harder to do, but I could probably figure it out. lifting stairs, I would so love to do that with electric hydraulics!!