If I were choosing between inboard and outboard servo bay, I'd use the inboard bay.

2.3m to 2.6m- why not a 3m? Picture to motivate... (it fits in a Taurus wagon even with the 3 blade prop on)

Dave, I'm running an AM 28x12- have not tried a quiet 2 blade yet, but like the faster speed of the 3 blade. It seems to work better with this design (a clean one).

Best of luck,
Don