Check the OSHA website -
www.osha.gov , and this area in particular:
http://www.osha.gov/SLTC/etools/scaffolding/supported/frame/fallprotection.html According to it, the height limit is 10 feet for supported scaffolds. Not sure about mounting any kind of platform that
my butt depends on off of prefab cubicle walls, though. I'd rather sawhorse it.