Okay, hold on a sec...you're kinda going the wrong direction with it. The space is so narrow that it really doesn't make any sense at all to divide it into two spaces that will each be EVEN SMALLER. Furthermore, it makes even less sense to then take each of those tiny rooms and reduce the overall volume EVEN FURTHER by introducing angled surfaces. You're going to spend a ton of money doing it and end up with pretty poor results.
I'd keep the space undivided, then trap the heck out of it. Do all the usual things: bass traps in all the corners and on the back wall (I'd do superchunks in the corners and at least 6" traps on the back wall), then do 4" panels absolutely everywhere else...reflection points, front wall, ceiling and the right and left walls near the back of the room. No diffusion. The space is too small.
Seriously...you don't want to divide that space...
Frank