Hi jaydear, sounds like we are in the same line of business. I am a printed circuit designer and also do the cases for them with front and back plates and graphics for the switches and displays. If you are looking for a 2D drafting package to create DWG & DXF files then "Draftsight" will do the job it is basically "IntelliCAD" which is an AutoCAD clone. It is a spin out from Solidworks and is free. To get PDFs out of it (or any other package) I use CutePDF, again it if free,in fact both are ad free 😀