There are people out there who have done this and as long as your paying your bills, you have no issues.

 - One interior unit will be 12,000 BTU for a large living room/kitchen space, and a smaller 9,000 BTU for the bedroom.the total system capacity has to be able to cool both inside units at the same time so 21,000 BTU or larger for the outside unit.The beauty of these is that they can be installed DIY (provided you get your 608 certification card), as long as the line sets don't need to be shortened or lengthened, as there is no brazing/welding involved, just connect the lines and purge air, etc.my dual zone costs comes in at around 2.6k to 2.8k for my 800sqft structure.

Plumbers are often expensive and a bit hard to schedule, so if it's something I can handle, I will try. 

You will be unlikely to fund new construction with that salary, sorry.Develop plans and a budget, timeline, expected rental values, P&L.

These are professionals with additional training and a stricter code of ethics.

One unit is in good condition while the other will need new flooring, holes patched and a full interior paint.

I put a nice laminate in the first house I rehabbed to rent, and it's not looking so good after spilled drinks, kids, mopping, and a few pet accidents.

I learned something from your comments that I hadn't seriously considered before:  The multi-year lease I think is GREAT for turnkeys AND for a newer investor who has a full-time job and a family to support may not have the time, energy, resources, or knowldedge to start from the ground up on with out-of-state real estate investment, I can totally see how turn-key can be super convenient and VERY attractive. 

Which is QT after 3 year of adverse position and a tax deed and that time can burn off while you only have a tax certificate.

Keep in mind, it is seasonal, short term and you will most likely have to require parents signature and a larger deposit to back up these tenants.