My main shop in central Utah is metal 40 x 120 with minimal insulation .. very cold in the winter even with the wood stove going full blast.. how much head room will you need if you decide later to add a lift. we have 16 ft sides walls, warehouse racking for storage. My wife's farm near yellowstone park shop has a cinder block walls that are filled with ground newspaper insulation that her brother-in-law manufactured...sheetrock ceiling and a gas furnace. an nice place to work but this time of year it is filled with produce we sell to the grocery. that should be gone by january. I have been looking at the ICF type of construction. strofoam block-wall systems filled with concrete. very energy efficient in hot and cold weather. we have been talking about building another storage-shop and Quad Lock is almost a do it yourself except pumping in the concrete.