The sheer complexity of this matter alone is enough to illustrate the problem, but this is just the tip of the iceberg.

Wanting to know some basics as well as funding options. 

Assuming your property is in Utah (like your profile indicates), here's the state law from a basic internet search:In Utah, a tenant who abandons a rental property without notice is liable for the lesser of the following: The rent remaining on the leaseThe rent plus the difference between the fair rental value and the agreed-upon rentThe cost to restore the property to its original conditionThe landlord can also remove the tenant's belongings and sell them if the tenant doesn't claim them within a reasonable time.

While every project is unique, the basics he highlighted are essential parts of any construction contract.

The benefit of old homes imo is that I go in and redo all of the systems and have basically a brand new house that I know was done right bc I oversaw everything.Most new homes are built with cheaper materials than the homes built in 1900.

Someone might be willing to purchase with negative equity if they are able to take over your <4% rate with basically nothing down. 

I essentially present to them my numbers of what I can redo the property for, and they loan me 80% of the ARV basically no questions asked except for an appraisal.

So basically its a "warm and fuzzy" about a property.

B) So you're going to combine unsheltered people and basic homeless?

A real basic guess is 30 houses each cashflowing $1,000/month.In Metro Detroit, this means $1500+ in rent, with the difference convering taxes, insurance, maintenance and vacancy - NO MORTGAGE!