I am starting on my exo cage today.... I was planing on it yesterday, but my friend had a better cutting device at work so he took my square stock there.....
I am going to run square tubing connected to the frame (5 locations on each side) and then 2 pieces of the square tubing on top of those pieces for mounting of the other tube....
it will look similar to this (but not yellow) and not exactly like this

Thanks for any suggestions,
nolan