I took the liberty of moving grj's original files for this project over to a new topic just to make them easier to find. The original topic started in late 2016 and is some 7 pages long; these files are found on page 5.
The only thing I have added to this is my user notes in Word format as an attachment. The gerber zip file is also attached below. I want to emphasize that grj is the sole creator of this circuit and these original files!