Hi Helius, I think you might be confusing a healthy American used market for a global one, so say you have a U$200 IIe, well that would cost at least another U$100 to ship here and then add another U$50 in taxes , so all of a sudden it's double the price, and what's to guarantee that it works when it gets here, returning it isn't feasible?
I like the idea of a $20 PCB, sourcing and soldering the parts and maybe using FPGA for the really rare parts. I don't feel I need the original case, PSU or peripherals, like I mentioned before a "hybrid" vintage.
Also it's a great reason to bust out the oscilloscope.