Very nice map! It offers the opportunity to sneak into the base out of turret reach (in Core Mode) and destroy the buildings, especially in early game the main base (Festung = Fortress?) mainly to prevent the Space Marines to be able to reach Tier 3. So I DID destroy the Fortress, which is not in the builder's menu, so it should have locked them down on Tier 1 or 2 without the Orbital Strike, which was the reason in the first place to do that.

But having done so, shortly after, the Fortress reappeared. Is that the game's AI or the map, which does not forsee such a strategy and just does not allow it?