Hey, I build it today, but it's not working :(
I checked everything multiple times but it seems my build is similar to your layout.
The 555 timer frequencies does work but I dont have any guitar signal output. i tried a few 4558/tl072, same result.
I will have an attempt on tracing the signal, but any help/further development is helpfull!
Let me know if you found something in the layout as well! :)
thanks!!
Make Fuzz Not War