I started with a Sears Ted Williams 531 frame. I bought a cheap, single speed cartridge bottom bracket in English, a single-speed freewheel and a cheap pair of BMX hubs on ebay. I respaced the hubs to fit the frame and built the wheels, each centered, no dish. The fork slots in the dropout needed to be filed slightly to fit the front hub. Picked up a set of single-ring bolts for the crank and used the inner ring on the outside. Everything else came from my stash of junk. I kept it cheap incase it gets stolen I won't cry too much, though I love the bike. Really pretty simple...