I imagine it can be done if an engineer stamps the conversion plans and building inspectors sign off. 

My current occupation is a chemical sales engineer.

During my inspection contingency I hired a foundation engineer.

There are definitely professionals to work with regarding land development.For big projects, there are consulting firms sometimes referred to as an "owners rep".Separate from an owners rep, a land use attorney, an architect or a civil engineer might be a good place to start.In terms of land that doensn't have any zoning restrictions, that is pretty hard to come by. 

They all had good jobs ( engineer types)and liked being in a quiet convenient neighborhood vs an apt..

So you would suggest analyzing the deal and if it has potential, moving forward, reverse engineering the #s, and making an offer for the price it would work at?

In fact they have three cabins now and quit their job as a General Motors engineer.

Started at 43 in 2003, as a side income, I still work full time in Engineering Transportation. 

Usually, the transaction engineer gets cash from the owner to take over payments, and it is not uncommon for the owner to subsidize the monthly payment for an indefinite period of time.  

The engineer's I worked with used a product called Citrus Clean in ship engine rooms for cleaning greasy things, so I imagine that is similar to Orange Sol.