I have not done that but great ideas. I have flipped the class twice this semester and it went ok. I gave the students 20-30 minutes to get group topic ready with specific questions they would need to answer for the class to make sure none of the topics important information was missed. This worked good. 

I like the rolling powerpoint idea. Thank you!

I will design myself with the 3 M's in mind as I move forward in the classroom.