Resin is really cheap; I spend about U$5 for 1kg polyester kit. Epoxy is about 3X that.
First I modeled the parts in 3d cad, and then made a cardboard shape a couple mm bigger to form a mass of material to be “sculpted” in the lathe. The beauty of working with resin is that once the original is ready, is very easy to make copies using a “silicone rubber” mould. This material is not so cheap, but sure not near $100.
The brass outlets are for strength, polyester is very fragile in thin parts. Maybe with a harder type of resin it could be possible.
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