Technically the Lucrihulks from the prequels were not military, but just converted armed merchsntmen, I will take one of those, with a side order of ICS SW calcs.
If your converting a civilian ship into a military one, it's basically a military ship IMHO. Your desire to min/max in this thread like its a Versus Debate is surreal. Plus it was literally defined as a warship and most notably a 'battleship' repeatedly in lore.
With that said the Lucrehulks are awesome. Waaaaaay back when this forum was first starting I thought of myself as a Writer and wanted to use a
Lucrehulk for another 'Civilian application' in an abortive Quest idea. While the thread was a failure, like most of my threads, the idea of using a Lucrehulk is sound, but not because of the stale idea of wanting to make a Battleship operate as a Battleship in a thread about civilian ships being exploration vessels but because the Lucrehulk has a big and neat design.
The Lucrehulk would be neat because of its awe inspiring shape, and white is a good NASA style color for space exploration, but because it is a huge cargo vessel. You have plenty of room not just for spacecraft and probe droids and the like, but also massive amounts of cargo space. I think a neat idea would be making it into some sort of Museum Ship... with the Museum being inside the actual vessel itself.
But for exploration purposes it could just have a lot of prebuilt displays and galleries and vaults for collecting various curios of interest while the smaller vessels it hosts do the exploration of the nearby space and worlds.
The fact it can be largely operated by droids can help reduce crew size, improve automation and ease workload for the organics on board, and potentially provide a stronger narrative for any story detailing the exploits of these space age naturalist explorers.