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I'm pretty good with my hands, but my first attempt with fiberglass was a disaster. I spent about $150 in materials to make a mold of a kitchen sink, and had nothing but problems. Problems with bubbles, problems with getting the glass to conform to the contour of the sink, problems with the epoxy setting up too quickly, problems with the glass wanting to stick to my hands more than the sink, problems getting the PVA to coat uniformly, etc.
I'd hate to think how difficult fabricating a part more complex than a sink would be. I wasn't even attempting to make a sink; only needed to obtain the negative image of the sink so I could use it as a form in a concrete counter-top/sink.
I also once tried to repair a crack in the plastic fairing of my motorcycle with fiberglass, and that sucked too. I'm done trying to work with the evil substance. 3D printing for the win.
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