My patience would have run out by now. Don't get me wrong, I've waited longer for an engine, but was never promised 2-3 weeks. Plus, I could drive over at any time to see the progress and talk to the builder. I'm guessing this guy is not local to you, or you would have been able to check in. Sounds like its not a coincidence that you're unable to catch him on the phone or get a call back. Very frustrating... I get the sense you don't want to say who it is, but it is possible someone here may know them and can provide some insight.