Turntable parts; catalogs suppliers custom shops

Google can tell you

Yeah, just google.....turntable parts

Needledoctor.com
EWsaunders.com

start at www.vinyl-engine.com

Origin Live have a dc motor and power supply
http://www.originlive.com/
Galibier Design have parts for platters
http://www.galibierdesign.com/index.html
Teres Audio have all you need!
http://www.teresaudio.com/
DIY HIFI SUPPLY have a good looking turntable kit you could build on http://www.diyhifisupply.com/

It will cost you far less buying a second hand tt and use the parts to build your own.

Try the analog section of diyaudio. There are some threads going at the moment for diy bearings, which I think is the hardest part of it.
I bought an old empire turntable, and built my own plinth for it, but used the motor, bearing and platter from the empire.

Randy