Six years ago, I bought an 1960's house that has an outdoor shower. Compared with designs suggested here, it appears to be on the small side—at just 4' per side. It sure seems plenty-big enough.
As it is very low-maintenance
and the run-off treats ornamental plantings to daily waterings, I use it a lot.
In your design, I'd include a roof, and skip any closed storage bins. The usual showering items can be kept within the shower itself, but make certain
any soap is in a mouse-proof container.
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Especially-important considerations I'd make with any new shower:
1) location and
2) especially if you're using lake water, an outdoor shower can be "powered" by
much higher water pressures,
much larger showerheads, plus the usual water-pressure-restrictors can be omitted.
Be prepared for depilatory pressures!
3) any openings to the outdoors...even with outdoor temperatures in the high 70s,
any wind will quickly turn a warm shower into a chilling experience!
