Sounds good, if you build it right I'll make the trip down every once in a while.
Keep in mind that the true tac-sim audience will probably be a minority for you. And the local LE might tell you they're going to train there but you may never see them, if they do, they'll want it CHEAP. The bread and butter that keeps these arenas running seems to be the 12-18 year old audience who attend frequently. But, you can probably put together a modular build that works well for both groups.