Sadly, we lost our home to the recent fires here in Bastrop Texas. The good news is that we have the chance to build our HT room exactly the way we want it. We want two channel audio AND multi channel movies to work - with a bias towards two channel if we have to... Here is the different part - when coming up with the room dems, there is one constraint: the length is no more than 24 feet. The width is open, but can be up to 20 feet. Ceiling can be anywhere from 8 to 16, and the floor can be from 0 to minus 4 feet,. Either can slope. There will be an attic space above that we can vent into (as well as use to IB a set of subwoofers, but thats another set of posts). So what size would you build and why?