OK, back on topic here:
The 3D Steering Committee has talked with Taelorn at some length about this class of ship and how it would fit into the game. The answer: Not very well, at present.
The archipelago frigates were rather advanced in concept for their time (which, as has been noted, falls a bit outside of the period from which we're accepting ships). In game terms, that would translate to a ship that was heavily armed, relatively fast, and that sailed best where other ships were weakest (close-hauled). Such a ship would tend to dominate anything smaller. In short, the heavier lateen-rigged ships are about as heavy and powerful as we currently want in the game, and we'll be closely observing the impact of the new Mastercraft Arcadia xebec.
While we could try to balance these ships out, e.g. by giving them light structure or sail integrity, experience has shown that this type of balancing tends to result in less-than-happy customers. We always like to prevent that as much as possible
That said, PotBS is a game that's constantly evolving. There may come a point where we decide there are enough, and varied enough, mid-range ships to warrant bending the setting a little further to accommodate some archipelago frigates... however rare or specialised they might be. We're not at that point, and while we always will listen to community input on our ships, FLS will make the determination when that point has come.
Of course, this shouldn't stop anyone who's truly interested in modelling an archipelago frigate from modelling one for their own enjoyment. We've always welcomed practice projects, and provided feedback as we feel appropriate, including what alterations might be necessary should FLS decide we want the ship for the game. Such work would be well in advance of our being able to use the model though, and the 3DSC would recommend interested modellers spend their energies in other areas for now.