Double trouble - Kastle-2 case

First: Thank you, Bastl, for giving us the key to your kastle! Amazing to see this great product go open-source.
Along that line, I would like to share some designs I made for the Alchemist and Wave Bard DIY kits.

--Double trouble - Kastle-2 case

A case, designed for two Bastl Kastle-2 units.
I wanted something compact, and prefer to use a power adapter (or powerbank/laptop when traveling), so decided on a flatter design without space for batteries.
You can assemble it using the parts in the DIY kit + 8 additional m3 nuts. I 3d-printed the case using supports for the indents for the nuts and the two usb-c ports. The holes for the jacks printed without support.

--Power using only one usb-cable
!!No official modification. Try at your own risk!!
I power both units using only a single usb cable on the left unit. The right unit gets its power from the left unit. Some easy soldering required. You can do this by:
1. Cut the connector and red/black wires from the battery compartment, lea