Here you find one of the first Manecolabs DIYs -
straight out of the Dark System M1
this is ... the H.R.Mixer :-)
4-ch. Mono with CTRL-Room out, 6.3 Phones OUT, Main out
You can choose to either do the only-pcbA+panel set and source the Potis and jacks yourself
or/ and get the full kit where you find those along with the unique Manecolabs T18 knob.