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I tore the vinal flooring out of my shack, and painted it with the roll in bed liner stuff. The vinal was really, really slippery when it got a little wet. It was a real safety hazard... Something to think about...
i would definetly insulate the roof. when warm air hits the cold metal it will condense and it will feel like it's raining in there! i personally prefer white styrofoam, or the yellow plystyrene sheets, but even batt fiberglass will work especially if you sheet it inside and put housewrap(tyvek) on the ouside before you side it. looks good so far!