damkiller Hey, haven't seen one of these for quite some time. Probably for good reasons.
You did a good job regarding protection and the thrusters should be sufficient too, but the Flak has a slightly blocked fireing arc (which hurts quite some bit when already having the smalles arc of all weapons) and your CRs are not only directly next to reactors but also exactly where I would expect the missiles of a missile barge to dig through your armor. I still haven't updated to 0.15, so I sadly can't check everything ingame and am bound to make assumptions, but the rails appear somewhat undercrewed (unless crew roles do that much) and the boost thrusters are rather pointless on a barge while also requireing two extra reactors fit right between those of the railguns ('splodyness).
damkiller I'd rather ask one of the guys with any knowledge regarding ship types, but the second ship appears to be a rail-rammer or something rather than an 'orbiter'.
The shields should get some armor protection and closer reactors, the ship could need additional protection on the sides and it's rather difficult to get some good hits with those rails if the ship lacks any maneuvering thrusters.
Also feel like your boost thruster setup is rather wasteful regarding reactors and crew and the railguns are somewhat short for main weaponry and appear to get destroyed rather easily.