GCI Murdock Plus is a similar circuit to Murdock but with the addition of hard clipping diodes, gain, and volume controls. It's a simple, somewhat transparent overdrive circuit with a maxed out HM-2 style EQ circuit as a parallel blend.
This kit contains all necessary parts, including pcb: Parts list
Three knobs for the pots are not included in the kit, you can select them yourself. The pots have round 6.3mm shafts.
Here´s the build documentation:
Murdock Plus docs