It'll be a lot of faff converting it to a fixed. With your budget I'd concentrate on getting/building a pair of decent wheels. And get a decent chainset. The rest you can pick up fairly cheap. Including a cheap frame and forks. There is to much work here for too little gain.
I can help you out with bars, stem post, saddle, sprocket.
Does the frame need to be a 20"?
It'll be a lot of faff converting it to a fixed. With your budget I'd concentrate on getting/building a pair of decent wheels. And get a decent chainset. The rest you can pick up fairly cheap. Including a cheap frame and forks. There is to much work here for too little gain.
I can help you out with bars, stem post, saddle, sprocket.
Does the frame need to be a 20"?