Rushed this one a bit, not one of my cleanest layouts, but is verified and adds some additional tone shaping to an already great sounding overdrive.
I modified Mark's original OD820 layout to add in the Paisley mids and presence switches. I also added an option to use a 2n5957 type jfet.
Note: There is a insulated jumper required. I used hookup wire and routed it across the topside of the board after everything else was populated. You can route it underneath using the adjacent through holes if preferred
And as with the Paisley drive, the center position of the Mids DPDT on/on/on switch needs to be verified. The layout assumes in the center position lugs 2 and 3 are shorted as well as lugs 4 and 5.
If the center position of the Mids switch sounds louder and harsher then the outer positions, then most likely lugs 1 and 2 are shorted and lugs 5 and 6. If so, then the Mids 3 connection should go to lug 1 and the Mids 4 connection should go to lug 6.
Rotate the board 90 degrees to fit in a 125B (may need to file down the edges just a bit)
1978 Gibson Les Paul Standard, Cherry Sunburst