Building a bike from scratch with used parts encompasses the worst of two worlds - the relatiive time and money expense of selecting, purchasing and installing (possibly with rarely used tools) compatible parts into a properly functioning bicycle; and acquiring used parts that do not have function problems, not all of which you may be able to detect. After all, if somone is selling used equipment it's for a reason. In addition we don't even know if your frame and fork are in proper alignment.
Even transferring parts from one bike to another is not necessarily straightforward. I would advise you to sell the frame to someone else who thinks a from-scratch build is a good idea, then buy a used bike that is only in need of overhaul and basic truing.
Last edited by cny-bikeman; 10-01-12 at 01:55 PM.