Back when I build my first shop, I priced materials and, on a whim, visited a shop that did "portable" buildings that were built on site. They used a factory cut kit and were able to finish a shed cheaper than I could buy the materials! I would two floors (double ply and double joists) and added 12" overhang all around. Quick work! Used it for years after I wired, insulated, and sheetrocked it. A window unit did climate control.
Now I have a shipping container...
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