The panel is approximately 49" wide x 19 3/4". To get the exact
measurements, you can download Autodesk's DWG TrueView 2009
(completely FREE) which will allow you to open AutoCAD files (.DWG and
.DXF files) for more accuracy.
In the DWG program, click on the "Inquiry" tab which will show the
"distance" tools which you can use to measure the drawing. :)
I don't mind that people use this as they see fit. Just do not sell it. :) Also, if you decide to use it (or are inspired by it, just make sure you mention me somewhere. LOL)