I found a reference to schaeffer-ag.de in an older thread, downloaded Front Panel Designer and found this can clearly do the job. It's going to cost around €60 for the front panel, so I'll wait with that until I'm sure I have a working build.
Things move slowly, lots of simultaneous projects, but I have finally gotten around to designing the oscillator PCB. I didn't have the patience to figure out KiCad or Eagle PCB, so I made it in PowerPoint - my go-to universal drawing tool
I am not going to make the peak detector PCB in PowerPoint, though, so I'll just have to take the plunge and learn a proper PCB design tool. KiCad, Eagle, or something else - any suggestions?
I used a three-deck rotary switch for the frequency multiplier switch, and removed one deck to make space for some PCB in front of the upper deck.
PCB, 101.25x57.5mm, component side, courtesy of Microsoft PowerPoint
Solder side.