I have no real answer for you but you could also consider a container home.

I will circle the building looking for parking, general condition, cracks in pavement and building, look at the cars, any abandoned vehicles, size of dumpster, garbage around the container etc.

The information contained in this post is not to be relied upon. 

If not, does anyone know the verbiage the letter must contain? 

Next goal is either another house hack, but my main dream is to buy land and build a A-Frame Cabin or unique dome or container home in the mountains.

These forums contain a wealth of information and just spending lots of time reading will educate you in many areas.

@Jerry GoingThe 50% rule  (or more realistically, the 50% guess) is a way to try and quickly estimate the potential cashflow of a property.The 'other' 50% contains all of your other expected expenses in one big round blob.  

Does anyone here have any experience building homes out of containers?

The denial of your application was based upon one or more of the following reasons: ( ) Information contained in a consumer credit report obtained from: (See list below) ( ) A consumer credit report with information insufficient to our needs was obtained from: (See list below) ( XX) Information was received from a source other than a consumer-reporting agency.

The lease contains a list of estimated cleaning and repair costs beyond normal wear and tear that would apply.