Turn key is for Doctors and Dentists who as a group are Horrible with investing. 

I have electricity and water already in the backyard and a sizeable cement pad.

Replacing the stairs with cement or metal stairs is a CapEx.Hope that helps

How did you find your dentist?

So this is what I know from experience, Pro: 1) if you wait 2 years you don't pay high taxes at the end of the year on your profit and you get more deductions.2) you can work on your house little by little and do a lot of work your self so you save money.And I think thats all the pro I can think of right now ( I am so tired just getting ready for bed after having a long day breaking tile and going up and down stairs carrying heavy cement boards).

.****, tell your dentist next time your at an appointment about your investment property and how you’re looking to do it again.

I found a few threads here about how great cement board is.  

Can i use 1/2 inch cement board for a sub floor in my kitchen had flood ripped up old sub floor now instead of putting new down would like to use 1/2in cement board 

They have Hardie board cement panels is one option.

I can’t speak to the numbers since I have not seen complete plans and specs and finishes level of construction site conditions etc. but overall they look average for a typical straightforward project with vinyl siding or fiber cement siding shingle roof mid grade level of finish.