You can pay a couple hundred dollars and do this yourself online -- it is my opinion this is dangerous if the structure is tested via a dispute, death or otherwise. 

From the pic I would say it is of no immediate concern or danger.

Again....mitigate your risk and do NOT feel pressured to buy a place like this.

Or am I getting into dangerous territory?

Also look for heirs to see if they are willing to QCD the property to you to mitigate foreclosur expenses, especially if you are looking to take the property and sell REO. 3 out of the six loans I purchased had the kids deed the property over. 

Or am I getting into dangerous territory?

Those landlords "took it upon themselves to learn" and were a danger to society. 

I called a couple of places couple of weeks ago in the Austin area and they were quoting like $200 to $220 per square foot which I thought was ridiculous and more expensive then regular house.Couple of more questions if you don't mind....since you purchased used containers, you were not concerned with what they might have carried in the past that might affect human occupancy or how did you mitigate that?

I'm not sure this form of risk mitigation has enough validity to solely justify a strategy that maintains high amounts of leverage but if you're already using a strategy that keeps a mortgage balance high it seems like an added bonus.

I think Jeff from Homerenovision was on the podcast and he has an youtube episode out for Texans to help mitigate damage - search homerenovision keep your house from flooding on youtube.