Gentlemen, It is an alternative method, however I just built a 18' x 8' box plus bunk over cab for my project using 1 1/4 square in the walls, 2x2 square in roof, 4 inch channel in the floor, and truck side alum .040, and 1 piece roof alumin, and trim angle. material costs including fasteners was about $3800.00 Time is cheap when its yours. Compared to the work and cost of converting a shipping container the new construction would be much nicer. Just a thought.
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