First you will want to modify the .scad files so that they will match your dimensions on your hand. (it may take a considerable amount of modification as I have yet to make this .scad file totally parametric.)
Next you will want to 3d print the pieces. This is an excellent time to program the Adafruit Feather board for later. I don't know if it matters but I strongly advise not programming the feather while it is running on the LiPo battery.
Finally the assembly stage so here you will want to make sure you have the right tools for the job, Soldering Iron, Helping Hands, Solder, Sponge/Copper Scrubby pad thing, and reasonably steady hands.
- Align the modules with the threaded rod (it is okay to use the nuts to secure them together.
- route and wire the modules together making sure to label which switches go to which spots. This is also a good time to test the programming of the feather by pairing it and shorting some of the proper connections.
- cut to proper lengths and solder to the board using the schematic in the clc/chorder github page.
- enjoy your brand new handheld mobile input system
cover the sensitive bits in a ton of electrical tape because I haven't designed a cover for it yet (muahahaha)