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we need gates that are separate from the walls.
Thank you for pointing me in the right direction. I figured it out. The necessary gate models are located in \Arenas\CombatArena\NewGrassarena_siege and are named gate_u1r0.xdb, gate_u1r1.xdb, gate_u1r2.xdb. They are linked to animations in the s_gate.(ArenaModObject).xdb file in the same folder. This file contains the paths to these animations.
The trick is that when you place this model on the map, it appears far outside of it; I noticed this by chance. But after that, everything works – the necessary animation is specified, and it is launched with a script.
Here is a video with the resulting result:
http://www.youtube.com/watch?v=uKcpuhkK7c4
After that, the map stopped loading in the editor; I guess I need to examine the contents of that map mod from the Outcast map.