I don't know why no one is responding. There's a pretty healthy community of airsofters in the KW and surrounding areas, and I think we're badly in need of a good indoor CQB arena that isn't located in Toronto.
At the moment, we have Flag Raiders indoors, which is honestly pretty nice, but it does have its shortcomings (paint jizz everywhere, relatively small). So an airsoft only venue would be great.
As far as layout goes, I would point you to YouTube and the many videos of various awesome indoor arenas in the States and Europe. Lots of structures, "mazes" and the like are pretty great. Bonus if there are multiple floors involved.
A few examples:
Unstoppable - YouTube
CQB CITY AIRSOFT ACTION JUNE 12th 2011 (TM MASTERKEY TACTICAL THOMPSON POV AUG GOPROHD) - YouTube