If people are interested I can sent the 3D-file for the 90-120mm adapter.
Adapter file would be appreciated! As others suggested, you can upload on Thingiverse or Printables. If you get enough downloads on the latter page, you will get free filament, too.

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Fyi, now with 1 merit you can become Jr. Member and post images. Just the typo is preventing your image to show up.

I can see that ttyACM0 IS NOT there. All I get is this short message in dmesg after plugging it in:
[ 419.698180] usb 1-1-port4: connect-debounce failed
All command were entered as root. Any ideas?
Okay, that's odd. What do you get with this command? Does it show up?
ls /dev/tty*
Again, do verify that power connectors to the board (2x 6-pin) and USB are all good. There were users in the past with (semi-)broken-off microUSB connectors.
I believe there's no flimsier connector than microUSB; its surface-mounted nature means it is fairly easy to rip.
It seems the device isn't picked up at all besides from the odd usb output messages.
The tty device isn't there either. I created a few close-ups of the board and connectors. Something that seems to stand out vs the full node Apollo is the blinking VD5+ led here:
Everything else looks fine imho.
I'm slowly running out of ideas here ...