The GCI HM-1 combines the distortion part and tone stack of the DS-1 with the boost section of the HM-2 tone stack.
This kit contains all necessary parts, except the pcb: Parts list
Here the pcbs: HM-1 pcb
Five 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:
GCI HM-1 docs