Shower in the country, this topic is very relevant. Usually, if the house is not big, then you have to equip a suitable room not where it is convenient, but where there is a place.
But you want not just a standard shower stall, but something original, in a rustic style. Nature is all the same. And it is also desirable that in addition to the shower there was a bathroom, even a small one.
Here is a photo of this version of the bathroom. All in the form of barrels, wood paneling, simple and natural, a real country. The main thing is that everything is placed very compactly, although it is necessary to tinker with wood processing. But such a bathroom can boast to guests.