The technologies in homebuilts have drawn abreast of those in production airplanes. Turbine power, pressurization, deicing, seating for four or more, advanced avionics, 300-knot cruising speeds — nothing seems to be out of reach. I have not heard of a homebuilt with a potty, but a homebuilt bizjet can't be far off. In fact, it's getting a little hard to figure out what separates certified airplanes from experimental ones, other than a placard saying — without evidence, by the way — that "this aircraft is amateur-built and does not comply with federal safety regulations for standard aircraft." I chatted at Oshkosh with a fellow who had built two turbine Lancair IVs — 300-knot, pressurized, carbon-fiber four-seaters — and was offering one of them for sale for $580,000. The Lancair Evolution, a four-seat turboprop, costs a cool half-million without power plant or interior. The Epic, a six-seat cabin-class turboprop, is about $1.3 million, but many builders would certainly spend more. These are extremes, but the average is headed in the same general direction. As homebuilding goes, we have left the old garage behind and are entering the realm of the fantastic.