Dengomatic? 100% anodized-free components. Edit: nah seriously, no idea what it'd be called, but I'd make small stuff that makes a difference. Like CNC backings, Magura replacements (pistons, TPA's etc) brake clamps that would be easier to set up, tensioners etc. Freewheels is another thing but then that's way too complicated to make. If I had the possibility, I'd try and make a freewheel with a Chris King engagement system just for private use, seeing as it's patented. I'd love to have a proper lathe and CNC machine, it's my biggest dream. Pity I'd have to sell everything I've got to get just a good lathe... Working on metal is just the best thing on earth.