Well, how big is it? That is the biggest thing, LOL. The Size of the unit will be the decisive factor. Next is what is the primary weapon system? That will set the Offense, and the primary Defense. Then you have the range.
So, if you tell me the historical/current ship, I can build out the rest of the stats from that, like speed, etc.
For Bear Island, how big is it, in square km, or do you have a pic/wiki page?