my friend lives up in the Bay Area (San Francisco) and belongs to a club/class that meets every week. their goal is to build their own stero equipt from scratch! It is all weirdo audiophiles who have $10,000 turntables at home, but just like the challenge of making stuff.
He has made speakers, tube amps, and a turntable (his has, i believe, a marble plynth - which is the base). the raw materials are expensive and some things need to be machine tooled or purchased (like tone-arms), but it is still a pretty cool hobby!