Hi Andrew,
This is to bring in your knowledge that Aspose.Imaging for .NET 2.4.0 now supports the conversion of DWG files to PDF format. If you are interested to test the newly added feature, we would request you to please download the latest release from the link shared above. Please also have a look at this article for code snippets required to load and convert DWG files.
In case you find any difficulty, please feel free to write back any time.