The Terran had the task to abuse the backdoors in the early game or the rock towers if it goes to the lategame. They played on every spawn location. The Zerg could break down the rocks before a 2 base timing could hit and had no problem to hold it. Both rocks are sharing their healths, which means both rocks get damaged if one or the other takes damage. So it's basically 1 rock with 1500 HP and 3 armor.
Still have to check 1 base allins. But I guess it will be harmless becouse just conquering the rocks will do no damage, while the player inside the base is increasing his army size on 2 bases and can attack the conquering forces easily from two sides. Also none of the players were complaining about the backdoors.
In one game the terran went macro and tryed to abuse the collapsable rocks. Actually the zerg hold the push, but due to only few test games, and the zerg was the opinion that tanks pushes are too strong and I haven't tested TvP yet, which might be worse for protoss I made an alternative version with no collapsable rock towers and even bigger chokes to the third.
Edit: nvm, I found the replays. dunno why I missed them.
replay01
replay02
replay03
and could it be that the pictures are not showing? Or is it just for me?