Never re-glazed tiled walls before but based on the cost of the tub and surround I would imagine it would be about the same so your prices are probably spot on.

Gluing the pad to the step might cause it in time to delaminate(since it's glued to the plank with a pressure sensitive) and release from the step especially when people are coming down the steps.Your chart covers a lot of the bases but not the ones that can't get you in trouble namely concerning the install.

You will be able to see the numbers based on some assumptions.

Civil records clerk claims the only forms they have are landlord/tenant eviction based on non payment of rent and I need to google the form I need. 

Based on my experience builders make a lot of mistakes during construction.

I currently live in Charleston and am a fishing guide by trade so I have a good base understanding of how water moves through salt marsh areas, but it'd make me feel a lot better about this purchase if I could have an expert look at it.

I'm a real estate investor based out of the Myrtle Beach area.

4) any Charlotte based resources that come recommended to help me structure this properly?

You have to evaluate based on market, but there are other means of achieving forced appreciate that might make more sense. 

Always weigh the pros and cons of each option based on your financial goals and circumstances.