Vintage pedalboard / unknown builder

This page is a draft so I can share some information and pics of the pedalboard. I'll update or add more information when more info is available

I'm still searching for leads. When interested or you know a good source, please comtact me!!

Beginning

So I bought this pedalboard in 2020 as I was trigered by some labels. Could this be filled with vintage EHX parts??

I got it from a guy in Deventer and found it on 'Marktplaats'. I got it the same night I discovered it.

Origins

The origins are unknown. I've searched A LOT! I've had some leads:

- A guy at Siemens should've build stuff like this for some professional artists in Belgium, the Netherlands and Germany

- Names: Dick Schoneveld?

The pedalboard looks really professional. I can't find any information on the outside or inside of the pedalboard. What I think:

All pedals have a date code around 1978; I guess that this pedalboard was made in this timeframe
The PSU had some caps replaced later as the solder is touched. Also some solder joints are untouched. No date codes on the caps.
One voltage regulator has a date code on it stating it is from '79
My best guess is that the pedalboard was for a Dutch or Belgian band, as the word 'Galm' is a Dutch word for reverb.
The detachable power cord doesn't rhyme with '78 / '79 but was common practise in the second half of the '80's
The output is an XLR jack; also more fitting the '80's
No gain pedal on it; maybe bass board? or keyboard board?
I've tried contacting the number on the case (Soundhouse Hoogeveen) but the number is disconnected. I also searched on facebook for former employees of this shop, but no-one answers to my messages.

Pics and schematic