At this point, I have to ask myself this:
?"What's the practical
 difference between a "genuine" Apple I and one constructed from old
 parts (even old PCB)?"
 In other words, what TANGIBLE difference is there?
 I think that this is a valid question for the scientifically-minded. 
Put some of the solder and/or traces under a microscope - the
oxidation will be different.
--
Will