What's the stuff we don't see?

[Ewokinarmor]

Hello. I'm new to Project Reality Mapping (not the game, though ), and I was wondering...
most maps in most games, especially mods, have stuff hidden that's not supposed to be found in order for the game to work. So is there any stuff you are supposed to deliberately place out of bounds (other than the main base) or make sure nobody finds?

[Rabbit]

Pretty sure just the commander artillery/support features, though do not confuse this with the command post, which should be on levels.