I would say check out CADQuest. Their textbooks are pretty good and they come with the example files.
They are easy to read and have a lot of information. The books seem a little long so I am not sure how it will work out for a quarter long class.
www.cadquest.com
And if you want to teach sheetmetal in the same class as modeling that is in a different book.
There are also some books by the author Toogood that are used a lot in colleges.
Paul
