This may help you source some supplieshi guys Iv created a good space in my yard for a reasonable size shed/garage, was thinking of making my own using box section, I'm pretty handy with a welder and steel can be easily enough, has anyone on here ever made one?
Cheers
I believe a steel framed & clad, movable shed, is called a container.
I would generally agree with Gaz, but disagree on the erection method, I would use chemical anchor and studding to anchor it and make it a bolt together unit.
You can get SIPS panels which come as an insulated sandwich with an outer skin of metal in various finishes which are quite slippery and easily cleaned, a variety of insulating cores of differing thicknesses to meet differing "U" values for insulation, and a variety of different inner lining materials ranging from wood sheet to various plasterboards.