If you prefer to build this kind of circuit on PCB then the BYOC kit can be found here:
I don't know if they are going to start selling the PCB separately but you can of course enquire if you'd prefer to go that route.
Now I can hear some subtle differences when at the upper and lower end of the Treble pot, which will very probably be down to tolerance differences in the pot itself which could be as much as +/-20%. I have to say in the more central positions I can't really hear any significant difference at all. At most of the demo settings they sound identical to me, and at some the Silver Pony sounds a bit fuller. Personally I preferred the Silver Pony. Great job Keith.
and the corrected schematic