This has been around for a little while now. I believe the website creator eveolved the item into an actual product. If it's not him then it is a design of a very similar nature. It's called the Micro35 and sells for an astoundingly low $500. Properly machined and built to tight tollerances using a real groundglass, not fiberboard and a plastic CD blank, so it has far better performance than the DIY version. I'm probably going to pick one up soon having seen it in person and impressed.