I understand the man dropping communication.....he wishes to sell you trying to talk him into keeping it. The man may well have long ago realized he would be in over his head and rather than start something he could not complete he wishes to sell it as an assembled unit rather than disassemble like so many that are offered later when the job left to do is more than the will to succeed. Tire kickers get kicked to curb in cases like this, started project often get the same treatment, kicked to the curb....your intentions were meritorious to a degree...just outside his game plan and not what he want to hear and waste of his time.