Type and layout for two-version textbook?


I'm writing a textbook for middle school students studying English as a foreign language. It's a speaking workbook, and for such a book to be useful, it needs a substantial teacher's edition. But I have so many questions about how to implement this!

1. I have 6 types of information that need to be added to form the teacher's edition. These include short answers, paragraphs, and tables. On most pages there's enough extra text that if I assigned all the teacher components a common design feature, like italics or boxes or a different type, it would look very strange. Any ideas?

2. With different text the teacher's edition doesn't quite match with the student edition; however I can make each lesson (2-4 pages) be the same amount in each version. Is that good enough?