for bonus points, assume it spins while it shoots
Actually, that was part of the original plans. I wanted to mount a few of these on a battleship, but as a stand-alone tower, it's still rather effective.
EDIT:
Actually, I'll see if I can mount a turntable on the top disc.
It would require hiding a few panels to get to rotating, but it's a small cost for a neat effect. I can just merely rotate/hinge the main disc. Even better.
EDIT EDIT:
And done. Now it's 300% more deadly. Now the top ones can independently rotate 190 degrees while the entire mount can rotate 360 degrees. Now I'm scared about the top tier.
EDIT EDIT EDIT:
This thing definitely has to be featured in an RTS (especially something like Starcraft or Command & Conquer). It's so damn effective. A 90-degree gun will always be in position and can be covered by the dual rotating turret facing you alternating between one and then the other thanks to the 360 turntable. You'll be under constant fire. Oh yeah, and it can also take on aerial targets, and julienne fries.
Soldier: "Aw fuck it."
EDIT EDIT EDIT EDIT:
Uh oh, I just came up with one last idea that'll take this beyond the impossible on overkill, making it 300% more effective than it already is. Add a turntable on the base. And give it independent tracking between upper and lower tiers.
EDIT EDIT EDIT EDIT EDIT:
Oh my goodness, what have I done...? Just imagine that WCS, and now have that tracking you. I've outdone myself big time. If only I can mobilize it now...
Don't ask why a bunch of dwarves are taking on this tower and a shred-bot with light sabers.