Now before I get into the juicy, this is obviously my first idea and not necessarily the best design. From having had some time to tinker I kinda like what is going on here, enough to post it publicly.
Things to keep in mind:
(1) I have 4 x L8 + 2 x L7 + 4 x L6 towers
(2) Weapons Lab is L7, Naval Lab and Tactical Lab is L6, Repair Yard is L7, Ship Factory is L6
(3) I have 4 x L6 + 2 x L5 storages for a total max storage of each res of 5.142 M
So as you can see the tower structure is fairly circular. With Polarons on the edges and Plasma Chargers in the middles and Gauss in between everything, the ring itself is a deadly circle to try and kill. But the Plasma Torp on top of the OP makes it all the more tougher. I have considered changing some of the Gauss for Plasma Torps, but at the moment I want to get things upgraded.
Even without the Plasma Torp I can't see Battleships standing any chance against this. There is way too much firepower for a ship that gets within range of all the guns on one side. So I can only imagine Destroyers doing any real damage by dodging 1-2 Gauss while ranging the Plasma Chargers or Polarons one at a time. That said, such a process is expected to be slow and challenging. The Plasma Torp just adds to the difficulty.
For all the newbies to the game, you can see I haven't prioritized defense to my RGs at all. This is because they have negligible value compared to the OP and storages and the more you spread out the easier you are to kill. I have my labs in close but this is not necessary during the times at which I'm not using them because I have all the tech researched that I can. AM becomes valuable later so I may hid a few of them nearer to the ring and replace the labs that are not in use with them.
Some of you might wonder why the protection of the Repair Yard and Ship Factory. Truthfully I may be assigning too much protection of them at the moment. But higher level Repair Yards can take time to repair when damaged and it is my understanding that a broken Repair Yard cannot launch fleets. That would suck. And since I'm virtually always producing ships I like to keep the Ship Factory relatively safe.
Feedback is always welcome of course. We're only just beginning this game so there are likely to be other great ideas out there.
I don't play much anymore =(