i think so, could you expand your ideas next time you post jamaylott. on the idea itself, i like it, especially if the building grew spike or some other visual effect.
Yes, but it shouldn't deal great damage, cause all the infantry would die there, and you could defend yourself almost only with buildings, and something against ranged atackers.
maybe spikes for melee attacks, and short range tendrils like the sunken, for range attacks. Melee might do 2-6 damage each time a unit attacks, and the range would do 16, because it would attack on a time basis.
Guys, I'm noticing more and more of these topics. This topic is marginally unique. It really belongs in another thread about Zerg building upgrade ideas. These things have been discussed. At the very least you should develop your idea and flesh it out before creating a topic for it. Thanks!