High/low room for a DIY'er. Pretty much reflective of what I plan for my next space.
High in higher end design principles, that will maximize performance potential performance. Low end in the actual seat count. But if one doesn't need a lot of seats, then
some potent fronts, and the limited speaker throw distances, then an acoustically isolated space, would yield impressive performance.
I do like the idea of splitting four of www.gsgad.com
Marty sub cabinets with a friend, to nail down their cheap 4 pack flat pack shipping. Couple them with a DIY AT screen, and
you just need some flat black finishes. DIY Sound has some speaker options for the fronts.
I myself like the entry door in the back corner, because it gives me uninterrupted side walls, for nice sight lines. A friend did some simple black speaker grill fabric walls, bought by the bolt.
That could hide surround speakers, and allow for some acoustical treatments, all hidden.