Rod: Thanks once again for the PDF version! Very helpful!
I've recently found that Mouser uses an ECAD software converter that will allow you to download parts and 3D models into DipTrace. And although I have had some difficulty with how it all fits together, it looks promising. It's called "Library Loader" from SamacSys. It supports a number of different ECAD products. I'm still testing it out for myself. If I knew more about how the libraries work in DT I might be able to explain it better.