Truck Door
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So came up with this a while ago but I had left it for a while because I was working heavily on a map. Now that I have pretty much finished the map I decided to finish this.
How it works
1. The truck starts off held up by a roadblock(i know thats amazing a roadblock holds a truck)
2. You shoot the roadblock until it breaks and the truck falls down.
3. The door is locked
Special Notes
1. It resets all on its own
2. Uses some less common forge items like roadblocks and trucks, now you can use grav lifts for other things you need.
3. The shield doors make it so you cant destroy the truck at the bottom
Pictures

Overveiw, I like my fort better than my switch lol.

The door before it gets locked.

Shooting the roadblock to lock the door.

The door is now locked.

Without any walls
DOWNLOADBungie.net : Bungie Online : Halo 3 File Details