ok, ready? drumrollllll ...

(the shower bag would be hung from the top)
btw, those are some pipes i have here at the house, they're used for my geodesic dome.
i plan on using smaller diameter pipes, not sure what size yet. i figure what ill do is when i fly into reno and go to home depot, i will prop up different diameter pipes to see at what point they start to be too flimsy for this. and to fasten them together at the top? i dunno, duct tape?
oh and i will be bringing a smaller diameter inflatable kiddie pool. i will then scoop up the used greywater and put into 5 gallon home depot buckets and pack it out.
so, whadya think? its gotta work! its just got to, i know it will.