That's how it all started, you did only get the schematics, the rest
was up to you...
A custom model, build up only from the schematics...COOL :-)
Since the late 60ies, the organs came as a whole kit, *ALL* you had to do,
was to solder the electronics and build up the IKEA-like cases...
There were several models to chose, later, in the mid-70ies, when the
digital organs came, building one up was much easier as there was only
one contact bebeath each key, instead of 12 or more...
The pride of the Dr. Böhm Organ company, the digital Professional 2000 from the end of the 70ies