Short summation: No way. Living in shipping containers is not a great idea. By the time you overcome all the hurdles, you realize the envelope is smallest cost of housing development.
It's not so much that it the lowest cost, it is that there are fixed costs that correlate to 'per dwelling unit'. Some of those are monetary, e.g. digging a trench for a sanitary sewer is pretty much the same for a tiny house as a McMansion. But the amount of effort is also mostly constant: getting permits and other entitlement for a four unit project is not that much less than getting entitlement for a forty unit project (and forty high end units are likely to require less work during entitlement than forty low end units because the high end units tend to be more politically palatable because they better improve the tax base).
