Nothing wrong with the PDF format, it just isn't a real engineering format. Any computer and view it, but if you want to get the data into a CAD package of any kind to manipulate, edit or print full-size then the dxf files are the #1 most common format.
Just my 2 cents as an engineer. If you need any help with CAD drawing or conversion of files or the like I would be glad to help.
Paul