Sounds like a scary proposition unless you know the guy personally and see receipts for not only parts but labor as well. It doesn't run but only needs a fuel pump then it'll be running 11's sounds way too risky for me. I don't care much for buying cars or engines that have already been built unless it was from a reputable shop that knows what they are doing. If I were you and wanted to do a hatch I would sell the bike find you a decent shell and do your own build. You may end up spending a bit more but you will be infinitely more satisfied with having done what YOU wanted to do rather than picking up someone elses dream project.