It'd probably be a genunine "Raider" class-i.e. a Bird of Prey equivalent, given the crew size, weapons load, and listed capabilities in the wiki entries already posted to this thread.
also, wrt the Maquis, um...
The Klingons weren't the people intent on locking them up or killing them-that would be (in order) the Federation (Intent on locking them up), and Cardies/Dominion (intent on killing them) so I just do not see how these would go Federation.
"when you're out of Birds of Prey, you're out of ships."