http://www.baileyreptiles.com/diy.html
http://arbreptiles.com/cages/cages.html
https://ball-pythons.net/forums/show...-Rack-Complete
And more if you use the search function of the forum
My advice because been there done that a long time ago, if you make your own use expended PVC (lighter, sturdier, flame retardant)