(suggestion) On the subject of rebuilding, I doubt there would have to be too much of it. For example, if the entire area we're talking about were one entire field, it'd be very difficult to play if there were only three entrances to a large building because it's very easy for whoever's inside to cover the doorways (thinking of capture the flag, deathmatch, etc). Fix the place up, but if there's a hole in the wall, leave it open, and even make a few more. This would make it more like a warzone, as well as allow team leaders to create more elaborate strategies.