I used the U shaped aluminum that is just under 3/4 of an inch for my track that I found at Lowe's. In the same section is also the flat pieces of aluminum And I used that to build up 2 layers in the bottom track. That will create a smaller lip for the glass and allow you to lift the whole glass section up and remove it. That also makes it easier to install it since you don't have to try and install the track with the glass in the track.

I used plexiglass and had it cut so that 1/8 of an inch is inside the top and bottom tracks. With the flat aluminum In the bottom track it will give u the space in the top track to allow it to be removed by lifting it up and the bottom edge will clear the bottom track.

Here is a link to the thread of mine and I have a link to a video I made.
http://ball-pythons.net/forums/showthread.php?t=210213

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