In, IIRC, Cap. Log 16, there was a bunch of Alliance Mauler SSDs printed. These finished off a set of conjectural maulers started in Starfleet Times and Nexus Magazine.
They were printed, as conjectural ships, for those free campaigns where the traditional Alliance races found themselves allied to, or stealing, Romulan Technology. This way, there was an "official" authorized design, so nobody gets the bright idea of making a mauler with 2 phasers, the engines, and a ton of batteries.
The Alliance never really built one of these ships, as they never really bothered to learn the technology. Remember, the Alliance is led by those "silly" Feds that skipped out on 30-person PFs in favor for 4 person Heavy Fighters. If Drone Boats are the starship equivalent of a scatter-pack, maulers are the starship example of the suicide shuttle. One big boom and probably no starship left...