Many changs. The most important is I'm the only one working on this one now. Absolutely not because I'm too shy to consult the original importer again.
The map is now an Arena Zone. Added spawnpoints for this reason.
Added invisible walls and ceilings to prevent easy escapes(?). Also because it was like that in the original game, including the lower ceiling in the main area.
Added few more meshes.
The main light has been updated.
Added special light to the lower rooms and the secret room.