Dave,
With the "old" EarthTainer II design, the upper 3/4 of the second container was literally thrown away. I simply attached a Plexiglas sheet to the inverted section, and used 4 small "L" brackets to hold it in place. This piece sat on top of a normal EarthTainer to act as a Cold Frame.
With the new EarthTainer III design, there is no such left-over piece (which is a GOOD thing).
Raybo
