Check this one out for simplicity speed and compact pack size
http://www.popoutside.com/store/prod...products_id=63
If you are interest i can get a sample made in China
Below photo shows exactly same design for a Toilet/Shower tent i have had made for my work (camping equipment) it is only different in size this is 115x115x190cm with removable roof. Pretty similar to the Coleman size.
The frame is spring steel so it makes a circle when folded and same folding action as those twisty window shades