Here are the STL files, Jaycar sells the red acrylic sheet, and the width I used is the same as the standard sheet, so you only need to cut a 60mm wide strip off their standard sheet.
The front Bezel has a larger margin on the left side to put power supply bits and pieces. The Bezel is a tight fit and doesn't need glue or fixtures.
A simple RF sensing circuit would be a nice modification to light up an "ON-AIR" version.
Josh will provide a link to the site that supplied the letters.