Actually it is a patented design. I get parts from a guy who has paid for the patent use so I get it for free. I am more interested in the G# key angle than the actual hole placement and size. By using existing parts here and there, I can keep my costs as low as possible. The flute in the photos is sterling but the keywork is plated. Gold Springs, felt kickers, 14K gold riser, modern scale, etc. and I can keep the wholesale dealer price a bit above $2,000. I never set out to build flutes but I needed something to sell in that price range. My main objective was to make a C foot piccolo but of about 95 built, about 70 are flutes.