Used the Zeus Mod
First Attempt:
Placed a Barracks Building
tried placing a sniper on the roof
Result:
Sniper falls through the building and dies
Second Attempt:
Placed a Tower
Placed a Rifleman on top of it
Result:
Rifleman Falls down through the Tower and dies
Expected result:
Any building placed by zues should be recognized as a physical objects and other object should interact with it exactly the same as they would an object already placed on the map
IE : A solider should not fall through the building
Note: I tried several other building with the same result