Is being a one man developer too unrealistic?

They created a library of body parts that are randomly mixed together with color variations.
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And it definitely shows in certain cases.

Yes it is possible. It all depends on what you want to do. In my opinion you need a few people to help. That way you can focus on what your strengths are. I wanted to do everything myself but just frustrated myself so now I have a Programmer and a Sound guy helping me. Trying to do everything is possible but it may not be fun.