Today on craigslist they had an ad selling portable construction site toilets for $99.00 each. Got me thinking that if you had 2 you could cut out the bottom of on the same size directly under the toilet seat and install a 4 to 5 foot piece of PVC pipe, then set the unit over a hole you dug and you would have an outhouse. For the second unit, if you removed the toilet seat and holding tank, then drilled 10 or so holes in the bottom and placed it on blocks you would rig up a hanger unit for a solar shower, they you have an outdoor shower.
Now if only I could figure out how to hide 2 portable toilets from my DH.