Build a 15,000 rpm Tesla Turbine using hard drive platters

This reminds me of New Yankee Workshop, where Norm Abram shows you haow to build wonderful stuff and makes it look easy cause he has industriual equipment at hand. Likewise, you too can build a 15,000 rpm Tesla Turbine using old hard drive platters if you happen to be able to have lucite blocks, a drill press and other special equipment. Nonethe less it is still pretty cool, even if I admittedly don't understand entirely the use behind a Tesla turbine.