I have never found anyone that does reproduction M416 tubs, but you can still get repo tubes for M100/Bantam trailers. They are not the same size as the M416 is 2 inches wider at the bottom (39 m100 versus 41 inches M416 if my memory serves me well). I think there may be some folks doing panels now. I will look through my stuff and see if I can find them. They did floors for sure (with correct drain holes).
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