The only problem I see is if the back panels dont lift up, you will have to step over and get on your hands and kness to clean iguana crap closest to the building. Get yourself a broad long handle taping knife,

http://www.walltools.com/store/advance-curved-blade-aluminium-back-long-handle-drywall-knives-blue-steel-adv-018-cb-024-cb-026-cb.html

best tool ever for cleaning iguana crap off concrete