2020 mountable Keyboard Tray for Rii Ultra Slim Wireless Keyboard (or similar)

This is a simple keyboard tray that mounts to a 2020 extrusion. It was designed specifically to hold this Rii K12 Ultra Slim WirelessKeyboard/touchpad: http://amzn.to/2ghaDOlIt can of course hold other keyboards or items.I use this in conjunction with my 7 inch Raspberry Pi Touch screen and Pi 2 to run Octoprint. It provides a nice little kiosk on the printer itself.The 7 in LCD mount can be found here: http://www.thingiverse.com/thing:1670214The 7 in Touchscreen can be purchased here: http://am