The Kona Classic is a 60% layout + left Function keys. Using a Teensy as the controller, the Kona Classic is provided as a do-it-yourself kit for left f-key enthusiasts.
Keyboard Maintainer: Maximillian Hill
Hardware Supported: Teensy 2.0
Hardware Availability: Via GB
Layouts that are preconfigured are shown here:
Make example for this keyboard (after setting up your build environment):