Hello again. Sorry for another post soon after my last. At the request of our local DM admin I was sent here to post this as its own question. Anywho, Ill get to it.
Starting at pg 112 of TOAR we get into the rules regarding advanced buildings. On page 113 there is a table that lists the various modifiers for movement and damage and the like for each type. Later on there is a section on pg 115 that specifically talks about Gun Emplacements. Most of these questions are in relation to the comment that a Gun Emplacement is treated mostly as a stationary vehicle in regards to stacking and attacks, but a building for damage [primarily the first part]. Anywho, the questions:
1] The start of this section states that a building type that has NA as both the MP cost and Piloting mod cannot be entered, but the GE specifically has rules [as stated above] in regards to stacking. Can a hex with a GE be entered by other units? Is the NA/NA specifically to state the GE itself cannot be entered?
2] Can multiple GEs share the same space?
3] Can GEs be placed on top of other buildings.
4] Can GEs be in a hex that also contains a terrain feature [such as Woods]
From the sounds of the stacking rule GEs seemed to be intended as smaller buildings that could be navigated, hence my various clarifications to see how closely they functioned to standard buildings in regards to placement. Im fairly certain 2 - 4 are no but to ensure Im not messing stuff up rules wise I came here further clarification.