I built your transistor design, but didn’t have a 300kΩ transistor block without the emitter grounded, so I used two 100kΩ ones.  I also didn’t have a 2.2kΩ resistor, so substituted a 3.9kΩ one.  I’m making some progress on the vacuum tube version.  The triode one didn’t want to work, so I’m using pentodes now.  I’m taking some cues from Bill Hewlett’s original 1939 thesis, your design, and some reading.  It’s oscillating, but not very stably yet.  I’m still working on it.