I should mention the layout of my basement first. Please bear with me. It's 36'x13'. I built a front wall 4 feet from the the wall that faces the front of the house. The TV, equipment rack and DVD rack are built into this front wall. The 4 feet in between gives me access to the back of the equipment. The HT extends 18' from the newly built front wall. The remaining 14' will be some sort of lobby/family room. There is no back wall in the HT. A curtain will separate the HT and the lobby. The reason for that is that I'd like to use most of the lenght of the basement for when I have family gatherings or parties with friends, and I wouldn't be able to do that if I had a wall there. With the curtain, I just slide it to the side and the whole thing is opened up. Onto my questions now: I bought 4 used theater chairs and want to start planning the building of a platform for them. But here's the thing: Since my HT will also serve as a party room, I'd like all seating (a sofa and the theater chairs) to be able to be moved to the side walls (parallel to them). I'd like to be able to push the platform to one of the side walls and for that reason, I can't permanently screw the platform to the floor. Has anyone done anything like that? My second question has to do with installing bass shakers to the platform. Any ideas on how to install them so they're not that visible but I can still have easy access to them? (While keeping in mind that I might need to move the platform to a side wall). Pretty challenging huh? Any suggestions?