A couple of comments on JFETS. Nyle told me he had problems with the 2N5163s. That may explain the problem with the NOS JFETS I bought on eBay and the two "dead" JFETS from my old stock. All the more reason to stick with the 2N5246s. He also said pretty much any n-channel JFET would work here.
I also gt some insight into why he used so few ICs. He said he was worried about obsolescence and not being able to find an IC down the road. A man after my own heart :) As the schematics are put up, you will see there are very few ICs beyond a '741 OpAmp here and there.