See this shed in use here http://www.tyrhos.co.uk .
This shed is a shower and toilet unit for my parents caravan site. It was designed from scratch by myself and built with the help of the family. The main structure is 3x2 cls with Shiplap cladding and it has a reclaimed welsh slate roof. The internal and external lighting system is going to be run off of a 12v battery using a 100w DIY wind turbine and the hot water will be run off a Morco gas boiler.