Another nitpick re. mortar setup, IIRC mortars tended to have problems in forests (risk of hitting branches on the way up), so maybe restrict the forest for their placement? (arty most likely as well, for that matter...)
By the way, found a nice free utility to create and maintain OOBs, so maybe these rules can be also transformed to a graphic form - or maybe not rules as such, but "typical structures"?
Utility is called FreeMind and looks like this:
(first attempt at the rules, which drifted to the "typical constructs" sphere)
The second is how I put together German OOB found at Bayonetstrength website:
