Here are a few links

http://www.baileyreptiles.com/diy.html

http://www.blueappleherps.com/page13/page14/page14.html

http://www.arbreptiles.com/cages/iri...ris_rack.shtml

http://www.reptilianprojects.com/ladderrack.html

http://www.riobravoreptiles.com/howto_easyrack.htm