If you mean the D3, that one (in its warp-refitted guise) is statted up in SFB already; though its predecessors, the D2 and D1, aren't (since they weren't around by the time the onset of Klingon tactical warp, and there is no true "sublight" module in print as of yet).
Fun fact; the first ships used by the Klingon Empire weren't actually "Klingon" at all; but left-over hulls from the time of the Old Kings. It took the Klingons almost twenty years to go from jury-rigging the derelict Old King ships left behind in their home system to reverse-enginneering the technology and building the first manta ray-shaped vessels.
(No idea what those derelict Old King ships looked like, though.)
Actually, if someone was looking for an out-of-the-way Klingon design which could have something "new" done for it design-wise, there is the LD5; published in SFB Module R8. A handful of them were built at the same time as the D6, intended to serve as the Empire's first true light cruiser; the design failed mainly due to the balky warp engines, of a size which no other Klingon ship at the time made use of. When the later D5 War Cruiser came along, the older class was re-designated as the "LD5"; the Klingons apparently considered replacing the LD5's original warp nacelles with those from the later D5, but this was never done.
The LD5 wouldn't be a great ship, and arguably it would be more comfortable in the Middle Years than the Main Era; but perhaps a "Stellar Shadows" version of it with the newer engines could be a candidate for new-hull-look status?