With all due respect, this is not the proper place for posting lessons on Inventor. For Inventor specific content, please refer to : http://discussion.autodesk.com/forums/forum.jspa?forumID=78
You will get useful feedback about your lessons if you post where the Inventor users post, not here.
Alfredo Medina _________________________________________________________________ ______
Licensed Architect (Florida) | Freelance Instructor | Autodesk Expert Elite (on Revit) | Profile on Linkedin