My apologies. I didn't get an email notification that you (or jaguar57) had joined the discussion. But thank you very much for joining. (Two heads are always better than one!)
Right after I posted this (and finally got the photos fixed), I put some feelers out to the Microelectricity Yahoo group (now called Batteries vs Germs) and to a friend who's bigtime into electromedicine. The responses from someone who actually built the device in the schematic and my friend has kept me mega busy looking into all the variables and options. And there doesn't seem to be any end in sight. This is very exciting stuff!
I hope to get back with you soon with some of the things I've found.
And thank you for the links! I will comment on them when I can.