Wetback Shower Toilet Facility. Utilise currently outdoor area to install wet room. I would encourage a floating toilet or even closed coupled toiled (external cistern for ease of repair) to encourage an airy feeling. The plumbing for the cistern and basin can be boxed in to create a clutter free zone and there is room to keep day to day essentials to hand. The over-all effect is one of perfect, streamlined calm.