Have you tried grabcad.com?
That was the first place I tried.
There are a few drawings but it does not seem to be of wrokshop quality.
I have developed models of 40 foot high cube ISO containers which I have used for my own product integration. Dimensionally accurate, but not all features, such as substructure, are included. If this would be helpful just send me your email. Modeled as a part file in SW2009.