It was a year or so ago a friend of mine asked me how my layout was going.  I told him of all the problems I was having.  He then came up with the idea of a purpose built shed.  I was not convinced at first, as I always remember my fathers garden shed was dusty and dingy.  After a couple of hours chatting it over I was eventually persuaded that a shed could built that was both lined with insulation and finished off with an inside wood skin.