You are reading the right material already.

Replacing one bad fixture between material and labor can end up being 3X the cost of buying the better quality fixture in the first place.  

Now just realize it will STILL need to be demoed , they dont burn it to the ground , and demo guys hate dealing with burnt materials . 

Educate the land owner on the potential profit run the numbers and go over the basic proxy and blue prints.Make sure you have a seasoned and qualified Builder/GC because they can be a deal killer with wasted time and inflated material and extended completion dates.

Read as much material as possible and go to some local RE meet ups.

@Steve CrispIf you meet the material participation guidelines and qualify for the short term rental loophole you should get a free cost segregation estimate to see how much you would benefit from the accelerated depreciation. 

You could argue that your property has not materially improved and does not meet the same value as the most recently sold properties.

From my research, I'm seeing $100-$150/sqft depending on complexity and material.

Most are flimsy, thrown-together with uber cheap materials. 

It’s important to have a clear understanding of both hard and soft costs (labor, materials, permits, etc.) to assess your budget accurately.Projected Rental Income: Research the rental market in the area.