Sounds like you have the room for it. I have flown in a gymnasium (a small church gymnasium) with the Blade line of heli's. Actually had about 15 guys buzzing around, 5 at the most at one time, but it was a blast. I wish I had a shop around here that was able to this. I enjoy flying my R30 but when its cold outside, I stay indoors...LOL
Good luck with it!!
-Nitro