I remember doing the same kind of hatching project in my class when I was little. Your idea sounds more fun though. 
Sadly, our eggs never hatched because one boy decided to play around with the metal knob (temp. controller) on the Hovabator and it turned out that all the eggs were fried.
I even remember warning him that he was messing with the temperature!

Sadly, our eggs never hatched because one boy decided to play around with the metal knob (temp. controller) on the Hovabator and it turned out that all the eggs were fried.

I even remember warning him that he was messing with the temperature!