Twentyxthirty is a good size for a one man shop. Electic cable can be buried under ground. Should be much cheaper than building a new even small building. Wood floor is good for part of shop. Easy on legs and feet. Cement board layed on top of wood in forge area will protect floor and last for a while. If you do choose to install a concrete slab, there are many options for waterproofing, many mentioned already. Google hydroid concrete additive before you make any decisions. My first post vice was mounted to an eight foot long pipe, 5' in the ground, 3' above. I set the pipe in about a yard of 'crete, welded a step for the post vice to set on, and a bracket for a large machinist vice next to and lower than the post vice. While I was messing with the concrete, I also filled the pipe to the top, for extra rigidity. Works well, and if I ever want to move it, I will cut it off at ground level and weld the whole unit to a mounting plate.
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