I felt the input of the old calculator was much better, but I do like the addition of the sliding scale at the end. 

Generally, lenders don't care as long as the mortgage is paid each month but that does not guarantee that yours would let it slide so you would be taking a risk doing this. 

I'm shocked that the tiny piece of string held everything together and it didn't slide when they took the corner.

So you've got to monitor that.Also,  you do not want to do a refinance and is followed closely by a sale and subsequent 1031 exchange without running it by your accountant. 

It might be better to refinance as much as possible while still maintaining cashflow and subsequently getting a HELOC in case you find a use for those funds that deliver a better return than the cost of borrowing.

Enter the 1st installment from the Rent Center, subsequent installments are recorded in the checkbook register directly.

Assuming everything will stay the way it is while prices slide is not a feasible assumption (US is currently in the longest Bull Market in its history and is head over heels the strongest economy in the world).

For about $3 you can get one of those zip strips that slide in and grab the hair.

I'm doing a small tertiary project in South Carolina and I need to put in a sliding front entry gate.

That wouldn't really be house hacking, since you can only have a family member living in it, not a general renter, and you also can't pass the unit on to a subsequent owner automatically - they have to apply to the town and be granted it for their family member, separately.