This is only my 2nd map. "Two Kingdoms" (first) probably shouldn't have been posted on Quadropolis as it's too big to be playable really and I'm sorry for that. But Octagon I thought was at least as playable as some of the other experimental open-space type maps seen recently online -- like WW or Flood for example.
_daMfr0: No need to be insulting ;) But I totally agree this is not the caliber of the standard-use AC maps and am impressed by your ac_factory thing. As for the upper wall textures, yes I had trouble with those as there is no numberpad on my Acer laptop so there was no keybinding for upper walls and I had to use "edittex 3" one texture at a time (clumsy). Since figured out to add a keybinding in "keymap.cfg" so I can use PAUSE key now for upper textures.
Initially had more details -- including a semi-enclosed domed roof structure -- but the more I added the slower it ran so the current version is simplified. Doubt I'll change it much right away, but feel free to tinker if you like :)