Here's a thought:
Antediluvian ships infested by some sort of marinal-spacial lifeform. An organism that dwells both in aquatic worlds and in outer space, evolved from Atlantis' algies. Great green tentacles protruding from the ships, etc.
What do you folks think?
That was me. That's nifty.
One issue though.
Vibrations may carry far across seas, not so much a vacuum.
Also, I see your weapon slots there, very obvious. How do they work? Hard points? 360 turrets? Wut?
True. And underwater the weapon would technically also prove useless, as vibrations quickly diminish underwater, leaving little more than a few bubbles after a short distance. Even more so in the vacuum of space. (you may have noticed how I'm treating space and submarinal as interchangeable for my mod)
However, consider these vibrations to be completely off the charts. So powerful that they literally ripple the fabric of space, as it would ripple water. The force behind this sonic weapon is -that- tremendous.
Oh yes, the weapons will be 360 degree turrets, for the most part.
[edit]
Thanks for pointing out your concerns though. This is all sci-fi fantasy, backed by certain theories of what is scientifically possible.