That chair is only rated for featherweight smelly cyclists to stand on, and the step off is dicey. And any tall smelly cyclists won't be popular with people trying to use the adjoining toliet cubicles. There have been other ideas around for years:
The Rocket Shower (or as the rest of the world calls it 'shower in a can')
http://www.hostelshoppe.com/cgi-bin/rea ... 1188314762
The Power Wash
http://www.hostelshoppe.com/cgi-bin/rea ... 1214516611
I'm too lazy to show more. My solution when no showers? I threatened to sit next to whoever was responsible for the showers being installed after reminding them that I was cycling 25km into work in the summer heat. There is now a group of us who cycle in, a few who commute by train but walk or pop into the gym before work, others with walking teams for lunch time, we all now know who to contact when the showers go out of action and the morning's flood of emails works, the showers get a priority fix.