I've been browsing the web for info and pics and so far it looks like most folks construct them out of 1" pipe (3/4" ID) and the designs are basically the same except for latch and hinge style.

If my calculations are correct it looks like it will take about 10.5' of pipe per door. I am psyched up for this project and will be picking up the pipe tomorrow.
If anyone has any pics or suggestions they would definitely be appreciated
