If you want a professional unit my suggestion is that you buy one from Wolverine. I priced up buying all the parts and assembling one and by the time I bought everything plus the chunk of aluminum to bore a bowl, I was only saving a pittance compared to what my time is worth.
BTW..... I actually do have the welding equipment, lathe, and other tooling required to build one.
Motor $180 + shipping
Steel $200+ ?
Bowl $200+ and thats for a raw bowl, Wolverine coats his
Electrical $50+ ?
Wolverine Techs Centrifuge is $850 shipped if you buy it through this site. Its ready to plus in when it arrives? I'm waiting to hear back from him right now. He's assembling another batch of them now.