After a long time of waiting, it finally arrived .... and Martin had major doubts. But after a few simple handles, he found a decent sound.
The chaotic composition and the motley components made me kind of mad until I had drawn out the diagram. Bruce seems to be very afraid of people copying his work - there's no need to be afraid, noone copies that :-). The boost switch on the bottom only changes the cathode wiring of the tube and the Deep switch has barely audible influence - and I know where he copied that :-)!
In my Bluesmen the cathode bias became omitted after the prototype ... you don't need it. The lineout has no frequency correction.
Conclusion: Robust work, good sound, with psychedelic circuit.