Yeah, that's about the size of an escort in
BFG. Cruisers in the game are about 3.5-4 inches long, while battleships are more like 6-7. I was digging around my
BFG site, and this is one of the better size comparison shots (it shows a
SM strike cruisers next to a standard
GW scatter die):
In the end though, the actual location of the ship is represented by the tip of the flying base's stem, so the actual size of the mini doesn't matter that much (provided it is on the correctly sized base, that is!).