The Black Cannon...how do you plan on making it fixed, but also able to be rotated to fit the necessary enemies? As in...if it's fixed in one position, it will always build that way, and impossible to rotate.

Of course you could make it turn but that'd be unfaithful to the game.

Besides, won't it be a bit unbalanced for the other sides?

Hmm, that is a question to wonder about, I dont really know, but a stationary Black Cannon does not appeal to me. This is not Generals, so rotational building placement is not allowed... I think giving it a ROT of 1 is ok.

Yeah, I think it should be able to rotate but very slowly, and a hefty price tag for the firepower.
To answer your question on the other topic eva, I used a dark-colored Grand Cannon for the mini-cannon and a 2x resized one for the Black Cannon. I'm still not sure if they should be buildable at all, or just campaign-only.
Another problem we need to figure out is how to get a 4-directional laser weapon, or if to implement it at all, since it would be unfair to make a weapon that can shoot to the other side of a large map...
Awesome stuff on AWnet!