Edit: Since this was originally posted, I decided to build the shed as further research and feedback on this thread demonstrated that an unconverted loft is not a suitable place for a model railway, and the shed gives me more space in any event. Later posts in this thread document the construction and fitting out of the shed, which was finally completed in January 2019. The original post is preserved below for reference.     Some years ago in 2015, shortly after I moved into my p