... Oh yes, forgot to say [to all] ... it's in the basement and the construction of the ground is pretty solid, wood, underneath that concrete, underneath that soil ... or that's how it feels on my feet ... so while it may be plausible that carpet is necessary, it's not all that a hundred percent important.
So, final verdict: 10 2x15 bass cabs and 4 tops??? That sound like a lot but it may be worth it, given what I want to achieve. ... Also, lights? I don't know too much about lights; are some lights better than others without fog/haze/dry ice? It's too bad that I can't use the effects, true, just wishing to do my best with what I've got.
Last, and this a concern, how much power will be zapped from such a performance? Since the hall was given over to us for free, I don't want to take advantage of the situation (energy expenditures) and I sure don't want to burn any bridges (I might/may have future frequent events in the hall so I want pull this off like a fencer's flail pointing right on target ... not a one-off battle axe)!