Are shipping containers still a thing ?

[Keith Thomas]

Hello everyone, So I am starting out looking at a plot of land in a very popular area of Pittsburgh. Was thinking of a strategy to get units on it. Thought about making a 1 unit (2bed/2bath) or 2 units(1bed/1bath) on it out of shipping containers. And see if I could get rentals/airbnbs. If that works whats stoping me from using the profits of that rental to stack another unit on top, again and again? Just a general thought. I know I need to think of structural integrity, reinforcements, etc . 

But it seems that the modularity of those shipping container homes would be good to "test the waters" instead of putting a huge amount of money into constructing a big multi unit.

But just wanted to hear thoughts !

thank you!