This has turned out to be a non-issue as drummer #2 has not made any practices (yet) - and actually easier.
Next question: Sound quality
The center is a big open room and empty (approx. 35'x70'), hard walls on the ends, storefront glass on the sides, cement floor and high sloped ceiling (10' and 20'). The ceiling is soft which really helps cut the echos (fabric covered insulation).
Drums are really loud, we are thinking of putting up a baffle in front. It's looking like the biggest challenge will be to find a decent working volume. I'm sure this has been addressed before. I'd like to find a volume level that will work for practice as well as indoor center gigs. Our audience will be a real mix so ear shattering volume isn't going to cut it. I have a Yamaha EMx style PA with 2 floor monitors which should be plenty for practice. Might need to move this over to the pro sound section. http://usa.yamaha.com/products/live_...6m/?mode=model