Too many variables to simply say "tile labor is $3-$3.25 per sq. ft."

If the line cant be refinanced, you may enter into the 15 year am period and it can crush cash flow if your assumptions were using longer terms such as 20 or 30.Further, unless it is a fixed duration HELOC loan, it is probably a variable rate.

The free ones online don't cover much, so many variables that aren't covered in there that are specific to your state's laws.

A loooooooot of variables in play.  

Wholesaling, like all other strategies, can work or not work, depending on thousands of variables, few of which anyone ever lists comprehensively in these types of limited scope posts. 

Llearn to crunch the numbers on a flip for the cash buyers if that is their exit strategy... fixed costs, variable costs.

There are variables you can add in too to make it more for short term rentals, like the cleaning fees.

It was nice receiving $25 each month for late fees, but the time I spent on supplies to prepare for the eviction process, e.g., The Notice to Quit, the Summons and Complaint and then having to go to court, and the filing fee's involved, etc., was costing me more in TIME (and money for forms) than the cost of a postage stamp or an envelope. 

What you described in your post is part of a bigger process which takes into account other variables such as - how long is your hold time?

Will renters then move away from the city (due to no longer needing to commute) causing a bigger supply of rentals in areas near cities?