Looking good man!
Another good option for sliding glass, which I have use when making monitor cages is using plastic tracking for glass. You can find it at most glass places. Comes in 10' lengths and you cut to size.
Example.
http://www.google.ca/imgres?q=plast...5&tbnw=135&start=8&ndsp=10&ved=1t:429,r:8,s:8
That thing is a piece of freaking art!