Adam and others,
Where are you getting those styrofoam egg boxes. I was just going to use sterlite shoe boxes but I like the styrofoam as it will help insulate the eggs and help decrease the temp fluctuations in the vermiculite.

Also, where are you getting the glass, Lowes or HD will cut glass.. any ideas

last, are you putting weather stripping around the edges of the box and resting the glass on that to help insulate it more?

any pics would be great if you dont mind