I always thought a post-Capella GTVA could really use something like a Moloch, only not as sucky.
The Derelict campaign is (I think) a beautiful illustration of the kind of problems that the GTVA would be dealing with, and a corvette-sized ship that can carry two or three fighter wings is just about perfect for hunting pirates and smugglers. I'm thinking a bit bigger than a Deimos, maybe 3 dozen fighters, and one Bgreen for offensive armament instead of 4 Terslash.
I actually modeled and posted a heavy cruiser way way back in the Volitionwatch days. 400m, 3 heavy flak, 4 AAA beams, and miscellaneous light turrets. I can't find any sign of it now, but that was three or four hard-drive failures ago. Too bad, it was really pretty.