Need Some Help With Switches

Oi, sorry if this is the wrong place to post this kind of thing, but I didn't see anything on asking how to do stuff in forge on any of the other forums, and Forging 101 didn't seem to have a lot of questions in it.

See, my problem is that I'm trying to recreate a map from the Guild Wars, namely Fort Aspenwood. In the game, the attackers have to kill the three NPCs guarding the wall and it will shatter, opening up your path. The defending side can go and gather amber from several enemy mines, and when it's returned, the walls will be rebuilt.

I know that I cannot recreate things like the killing of NPCs or the gathering of amber, but it would be nice to recreate the walls. I was figuring that the attackers would get a rocket launcher that could be used to destroy the wall, which could possibly be made out of movable objects like crates, that are slightly reinforced but only to the point that bullets and nonexplosive weaponry won't be able to easily penetrate it.

Now, here's where it gets difficult. After the wall has fallen, I'd like to make it so that it won't respawn (quickly, anyway,) and that the defenders could go out and destroy the mining camp to have it rebuilt. Is there anyway to make a switch like this? Would doing an instance switch with crates work, or does that only work with explosives?

I need some halp, or at least someone to tell me if it's not possible.

 

Yeah, but hitting them would move them around a bit, no?

 

Ah, well, either way that's not really the problem. Rather, I still need to find a way to make said destructible wall rebuilldable when a different switch appears after that wall is destroyed.

 

Alright, just tested it out and that does work, thanks. The only issue is that sometimes the wrong box falls first, meaning the wall doesn't come out perfectly, but whatever. It'll do.