They can make money but from what I've seen your more in the customer care and takes more of your time.

-Decide between fixer-uppers, which offer customization and appreciation potential but require more work, or turn-key properties, which provide immediate rental income with minimal effort.Hiring a Property Manager:-A property management company ensures efficient marketing, tenant screening, rent collection, and maintenance.

The sub floor was completely saturated.

I find it unlikely that one could build a house out of a shipping container cheaper than one could build a stick framed house.I work for a custom home builder, and we are a union shop.  

I have a great bubble of subs, just not the finance part!

After experiencing different types of inspections with all kinds of properties from custom builds to existing, it all depends on your end goal , I highly suggest you reach out to a team, really strong team such as @Jorge Vazquez.

You must asses if they are they the weekend weed smoking warrior or are they number 1 customer from Breaking Bad. 

Understand it's a business not a RE pursuit meaning make sure the experience is #1 for the customer.

Yes, you can enforce your lease agreement as to the tenant, but unless you require the sub-tenant to use a specific lease agreement, the tenant could use a lease agreement that does not match the way your lease agreement governs the tenancy.

Maybe uncheck the sub property type.