LED Pixel mounting box

This is the box I designed for my led pixel matrix. It is currently configured to host a single strand of [Ada fruit 12mm led pixels](https://www.adafruit.com/product/322) in a five-by-fixe matrix. You can use pretty much any microcontroller that supports spi to run the pixels. I ended up using a raspberry pi.

The back panel contains a hanging element with multiple points to account for an off-center balance after assembly.

There are provisions for joinery, perhaps too much. It is a captive nut design using [M3-0.5 Class 04 Zinc Finish Steel Regular Square Nut](https://www.fastenal.com/products/details/0161907) and [M3-0.5 x 20mm DIN 7985 Phillips Drive Pan Head Zinc Finish Steel Machine Screw](https://www.fastenal.com/products/details/91192).

Pretty much every element of the design is easily adjustable by modifying the variables in the `joinery()` and `main()` functions.