i'm building up an old bike a buddy handed down to me. it has a 5 speed cassette that is pretty wrecked, the whole shifting unit is gone, so took the derailleur off and was about to put a single speed kit on it. now i changed my mind, might choose the third sprocket to put a chain on and ride it as a single with the whole cassette in it and save the money for a whole new wheelset, since both rims aren't exactly the same size anyway. after that i might change the crankset so i can make it a fixie (current crankset is an old one piece unit and the arms are a bit too long, 1900mm, to ride fixed comfortabbly, might hit the ground) and then get an actual nice frame and migrate all the parts into that.
i live in a city full of bikefantatics so i hope i can make a good deal on a used wheelset and crankset.
i found this site that sells njs frames and the cheap ones aren't that expensive around 300-400$, but they look pretty run down and come with dents, which doesn't bother me too much. i might save up for one of those, because it's hard to find a frame in my size and the njs ones come in xxs sizes like 48 cm seatpost tube height, which would be best.