I want to get to a point that I am comfortable with the units I have (i.e. they are the right ones, in the right quantity, and will provide sufficient income when paid off) then work on paying them off. 

Could be a tiny bit could be a lot, but definitely seems worthwhile to ask some veteran landlords what the impact will be.

It's a tiny house and I got a great deal on it, but it needs some work.ictures are below.

Not sure you will have too many others who can give first hand insight on the topic here in SD, as this would be the first tiny home community in the area that I'm aware of. 

240 units @ $60 monthly = $14,400$14,400 * 12 months = $172,800 gross profitIt's like have 240 tiny apartments for rent, OOOO, I'm In, getting on this tomorrow..

B class off market rentals with distresed sellers will result in a lot different quantity than buying turkey, sorry, 'turnkey' OOS at full retail or buying A class off the MLS vs d class hood junkers.  

She luckily has a lot that will accomadate another residence and we are going to build her a tiny home, which once built should create enough income for her to quit her job and just manage the two rentals.  

How did you come to the 2400 SF quantity?

It worked for me because I had a tiny bit of money saved, I wasn't allowed to live with my parents anymore, and I had the 2 years of w2 proof.

You already posted this scenario.. while it can happen you will have to hunt for it.like all things real estate returns price for risk.. rare is there high cash flow AND appreciation.. and tiny appreciation like 3% a year might look good but its not real.. you buy a rental that will make 12% under your scenario you need to find a 50k house that rents for 900 type thing .. which you can find.. so 3% appreciation it goes up a whopping 1,500 a year.. but in reality it stays at the same value.. since the next investor wants to make the same money you are.. only way values increase substantially is rents go way up.. and in cash flow markets rents ( which is a good thing) are generally very stable with not a lot of movement up or DOWN.But for your exercise check out small little towns in PA  and outside of Pittsburg and up towards Erie.. you will get the cash flow i bet.. appreciation only on paper not in reality.