Okay, since I think it's incredibly moronic that any outpost (existing SST maps) would leave their gate wide open for enemies to just stroll up and gouge their eyes out, I came up with a much more realistic siege system that I've already tested and works fine.
When enemies begin to appear on the horizon, the gate on the ramp(s) will lock, auto-opening for your units, however. So the enemies are now rushing full speed at a wall with a bunch of guns and cannons on it.
Stick some traps on the wall, with locations over them, and give them to a player that is neither giving shared vision to you, nor allied
by (keyword by, not with) the attackers. Set up triggers so that when a trap is destoyed, enemies at that location get teleported onto the wall to rape you. To make sure that they keep sending units to that location after the trap dies, make 2 traps at each location, but make the missile trap be the trigger trap, and a flame trap for a lure with a lot more health. Make sure the controller of the traps is allied with the attackers, but the attackers are not allied with the traps, so the wall isn't shooting out missiles and napalm. The traps should just sit there and be slowly annahilated.
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well I think the idea isnt bad, but how r u ganna have traps work will the wall be walkable were traps spawn/die?