THe fact that you're doing your own modeling seperates it from the other figure. Everyone models differently, and quality shows. There's a ton of Vicki dresses that look alike in style, with very minor variations. Let's say your ship is a galleon. The other ship is also a galleon. Yours will have a slightly different style, the way all galleons did (after all, each was made from a slightly differing blueprint). Your textures will be different. Your rigging will be different. It's not the same ship. In fact, your ship may actually increase sales of the other one, since you'd want two different ships in a good sea battle. An example of this is the Aeon figures. People picked up David to get the converted morphs Dodger made for the Aeon figures, then transfered them to M3. David sales increased, his morph sales increased, and Aeon sales increased. Go for it.