Anonymous1: Well, the original models were manually made by artists, so anyone with access to a free modelling tool like Blender could reproduce them based on screenshots and concept art.
So if those models aren't extracted directly from one of the games (there are tools for that, including extracting models from emulator ROMs), they could have been modelled from scratch by someone competent, even if all that person did was find these "fan" models online for download and added in the genitals.
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So if those models aren't extracted directly from one of the games (there are tools for that, including extracting models from emulator ROMs), they could have been modelled from scratch by someone competent, even if all that person did was find these "fan" models online for download and added in the genitals.