A lot of ForgeWorld models are variants. A few new parts to join existing parts together, and the rest are bitz from other models. The mega bolters on the Macharious are the same ones on their warhound model. It does give their models a more consistent look, though. And having bought a resin model or two from them, I can attest to their great customer service and high quality. It's just the price that's ouchie. As for the Manta . . . it's beyond my scope of abilities. Actually, so's the Orca. And after seeing Doc's Baneblade under construction, I HAVE GOT TO GET MORE FREAKING INK!!!!