I do completely agree that there is a lot of overhead on the professor, but I tend to believe that any professor that would like this idea would be able to rationalize spending a weekend to be able to explain what she created all semester. I can't imagine a cooler lesson plan than detailing your design decisions as you made them.
Presuming it takes a weekend to solve some sort of problem that at least some other people have. Presuming they're not only a couple weeks ahead of their students in the course's material.
