I found a great set of outdoor shower plans here:
The instructions are logically laid out and easy to follow. The parts list is accurate. The sliding door is awesome. And as you can see from the pictures below, the results are outstanding. It took me three weekends. I had to build some sides higher than the five foot design to overcome the surrounding balconies and windows. My brother-in-law made the door handle and guide by hand, and did a great job.