The model itself is dumb, illegal, and filled with nothing but idiots.

Collin, Amazing progress and you are an role model to everyone for grit and persistence. 

They also did the STR model while househacking and are doing well.It can be done, but you may need to get a bit creative with your tenants, not just relying on the LTR model.Best of luck!

I've modeled it out a couple of times. 

I would still contact the entities suggested, but if you want STR cash flow, it may be best for you to stick to the STR business model.

Specifically for the rent-to-own model do you know which components go into determining "strength of the deal"?

A business model that has always made sense to me is teaching people how to find good deals and have them bring them to me for more critical evaluation and execution where I invest my capital beside yours.

I had a intro call with them on Friday and their business model sounds amazing, but maybe too amazing. 

I needed to replace one, and they are very expensive compared to a standard 30” model.

Based on the value of a property you can likely get away with a inexpensive desk top study such as condos and you will require a more comprehensive engineering study for larger properties like a 4plex.Desktop / modeling options are sometimes good for smaller residential like you mention.