I had a look at my more complex files but decided they were problematic as they are full of XREFs and other problems. We can get back to the issue of complex files.
For now I've made what I hope is a useful set of files which show pretty much all the things I know in AutoCAD. Not shown are any of the issues of formatting for printing. In AutoCAD that is generally done in Layout View, all these files are only worked on in Model View.