First a look at the schematic.
Next step will be to wind 3 cores and gather some test equipment and probes. First I should point out the mods I made to the original circuit. I did not put the resistor in the drain circuit. In the build I may use it. I put the bypass below the tank in the drain circuit. I wanted to bypass the tank with the high frequency signals. I used a different JFET simple because I don't have any MPF102.
Anyhoo, time for a build.