I built a conversion as my first fixed gear, and I still ride it today. Its a schwinn world sport from the 80's. Its nothing special, but the only reason I did it was because I had all the bike already, along with all the parts and tools to convert it except for a chain ($10) and rear wheel, which I got from a friend for $20. If I had to buy wheels, crank, bottom bracket, tires/tubes, cog, lockring, and a chain just to put them on a frame that weighed as much as that raleigh, I would much rather buy something new.