yea heres a pic to get the general idea. stuff in there has changed slightly but you get the idea
The Bitty-Boom V2's were originally designed for stereo sub use, which might work pretty well in your room given the unique layout. You could wall load them in each corner (as designed).
My Sonosub will be about 40" tall, tuned to 20hz with a flared port, with an 18" Sonotube. I'm using a 12" driver ($150) and a 300w amp ($120). Still an investment, but far less expensive than SVS.
I just got my circle jig (Jasper) last night, so I'll probably be doing some slicing over the next week for it. You'll need a tool to make accurate holes - I'm using my buddy's Porter Cable router and a $50 circle jig. I was just going to go the string-and-nail method, but since I'm doing a bunch of cutting, I figured it was worth the investment to get accurate cuts with pre-defined increments & precise, repeatable sizes.. Jasper Tools has a model specifically for cutting speaker holes - it does 1" to 18-3/16" in diameter, in 1/16" increments:
http://www.parts-express.com/pe/showdetl.cfm?Partnumber=365-265
They also have a larger model that does 7" to 52-3/4" in diameter, in 1/4" increments:
http://www.amazon.com/Jasper-300J-Ro.../dp/B00009K77C
My Sonosub uses an 18" tube, so either would work unless you want a really big lip over the edge (as most Sonosubs do). That's pretty much the hardest part...cutting the circles. The rest is really easy. I'll post the details when I'm done!