Fixed some minor stuff, put all of the electronics on the sides and made it multi-color.
There are three versions of the headband. One for my custom "Gyro Core" PCB, one for regular Pro-Micro board and one for the Pro-Micro with USB-C connector. Last two can be bought in most electronics stores.
There's a GitHub page for it which contains the SteamVR software but it's still work in progress.
https://github.com/ManoloMancelli/Sideloader