For reference, here is the original trace with the voltages. This will help you get into the wheelhouse where jfet selection is concerned. For the mosfet, I found that the BS170 landed closer than the 2N7000 voltage wise, but they sounded pretty much the same. Whatever Phil has on his schematic as spec'd jfet or mosfet is what got me the best results.
For the PNP Germ, 75 to 85 hFe, less than .1mA leakage works fine. I used a Russian MP20B, voltages are spot on. All voltages on the breadboard are at +/-10% or less.
As for the Harmonics control.... it's VERY subtle. If you want to hear it working, crank your amp, and just twist the knob back and forth. You should here the upper frequencies (slight hiss) come in as you go to max.
REMEMBER!!! THIS IS STILL NOT VERIFIED. ONLY TESTED ON THE BREADBOARD.