-snip-
Assuming all of the information from the OP is correct, the intaikus is a support role ship. Taking on any given ship, built by anyone, so long as it's the same scale and that ship itself isn't support / research / aka has military purpose, would be tough odds.
Cutting off all direct communications... Well stuff, and do you have a way to explain that? Shooting at them with plasma I suppose? Ooh or cell phone jammers? Being that you're in space and information is just a wave, which bounces off of MOST solid structures, you would have to either put their ship in a loving
bubble, or find a way to intercept those wavelengths without being there to ACCEPT them.
Ideally that's all fine and dandy, that's just how I'm interpreting this in an RP perspective, but what really throws me off is this;
125mm railguns, smallest of their class, intended for larger targets
if they can't hit it, drones can
Railguns, which are essentially space snipers with super sonic bullets... They are the smallest possible turret type, but they're INTENDED for large craft. Already doesn't make sense. But then you add in the DRONES... Having drones is fine and dandy sure, but if they go unchecked, then they get hacked. Just look at all the drones the US Military has had hacked. Hell they still get hacked with people sitting over the loving plane watching the controls via a computer screen. Now assuming you have someone watching them and a "space anti-virus firewall" and assuming the drones aren't rigged to explode on impact or something, they look like fighters. And a fighter would do very minimal damage to, say, a cruiser.
But then again, I could just be looking at EVERYTHING all wrong.