The N.E.W. DIY HM-2 is the classic circuit, with additional clipping options as well as the choice to make the ?hi color mix? the original single knob for both mid and treble, or to split mid and treble to their own pots.
The pcb has the dimensions 82x56mm. It comes along with the an 3PDT pcb.
Here you can find a ready to solder kit:GCI HM-2 kit
Here´s the build documentation:
GCI HM-2 docs