@Caustic I’m doing something similar, cramping my VCO into 100x100 board and stacking it with pin header connector.
Don’t mind the wrong holes or missing ground plane. Still work in progress.
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I have taken up it as a mission statement, to do everything in that 100x100 format 
Here I can have two power supplies in 100x100
Quick and Dirty Power Supply:
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Nice. I’ve been thinking about drawing up my own power supply board I can etch myself as well. Though having a ground plane on one side would be nice and I haven’t worked up to etching double sided boards just yet…but a PS board would be a lot simpler to experiment on than the other DS boards I’m toying with.
On thing though - you sure those traces are heavy enough for a PS board? Remember you’ll be carrying significantly more current than most modules need to. I don’t have a trace width calculator handy…but I have a FC power board sitting next to me and it looks like they’re using 2mm traces for their power lines.
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Finished my second mostly simple 3340 VCO on a PCB of my own design and etched at home last night:
Finally stepped up to board mounted pots for a more securely mounted board. Almost worked first try too. Just rushed the etching a little and had a few spots that didn’t fully etch I had to cut traces on…and one spot I flubbed with the iron and bridged to ground that I didn’t notice at first.
Timing worked out perfectly too. Took 2:20 minutes to print the 3D printed panel. Hit start on the print then began etching the PCB. Finished panel came off the printer just as I finished testing the board and was ready to mount it up 
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They sure are not heavy enough. I have only quickly connected the nets with smallest settings. This is just the initial mockup.
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“TL0734”?
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Oh nice find. Probably would have never noticed. TY.
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No mounting holes for the 7812/7912? And all traces look very thin to me. Better make them a few mm wide.
Yes, good catch. The power and ground traces should at least be around 0.75mm, those look like 0.25mm. With this board, it looks like you can go quite a bit bigger for safety without much issue since there is a lot of space too. 
Added the ground plane.
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When you’re that close to filling 100 by 100 mm, it may be worth noting that in fact JLCPCB’s price doesn’t go up until you go past 102 by 102.
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and someone will have to make some strip connectors to join two of these together for a 200 mm Kosmo rack .
Well, I finally finished my project upgrading the bed room. Built a new bed frame, night stands, and mantle for the fireplace.
That means we can stop sleeping in my study, so the 3d printer can go in there and get off my soldering bench… And THAT means I can finally do some soldering again.
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I’ve also been churning out Kosmo size panels for my Eurorack kits.
Maybe I’ll actually get around to making music again.
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Well, if they are thinking what I was thinking, the 100mm x 100mm would be for the gubbins, and you can just mount that to kosmo sized faceplates.
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if they are exactly 100 mm it would be easy to join together and make a double .
when I did these MFOS modules the art work wouldn’t scale to 200 mm very well so I put two together .
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Well hot damn. Can you go into details about what sorta apparatus you are using to join them?
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Tonight, I’ve built THE BRAIN board. Includes dip switches for midi channel select.
Here is the updated MUX HUB board.
The last two boards I am planning before I send these off for manufacture are the two types of control modules, one for faders and one for potentiometers.
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the modules in picture are on a single piece of metal it was just the art work that was split . as for the 100mmx100mm panels a strip of metal , etc. with 4 screw holes in it and 4 machine screws / nuts should do the trick .
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How is the flex with that setup? The way I am imagining what you are talking about, it seems like it would have a bit of give to it. I suppose if it were ever a problem, you could do it on both sides perhaps.
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Another thought.
Put a screw connector for connecting the PSU to the busboard.
These IDC cables really aren’t designed to carry power, only data (a few mA).
They are kind of OK-ish for a single module needs, but certainly not for a busboard with a dozen modules.
Example:
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