I'm wondering if its safer to set to "At least one day".Any thoughts or opinions would be most welcome.Bill

Still looking for alternatives outside of an excel sheet.

If you are pitching these models/investments to someone else, including this does make you seem more sophisticated & safer to go with than someone who doesn't, but the reality is they are rarely used to make actual decisions.

Is there some sort of solution where I can keep the old railing in place and make it safer without breaking the bank?

Great alternative.

However, I've encountered a setback as my initial lender has withdrawn (100%LTV), necessitating the search for alternative financing.

For conventional financing, condos need to be 'warrantable' if the condo or HOA doesn't meet those guidelines it is 'non-warrantable' and there are alternative or Non-QM (non conventional) lenders that offer financing.

But what if you purchase with alternate financing (sub to, assumable (look at VA but requires OO), owner financing, etc) and only did buy, rehab, rent, and repeat (one less R)?  

In our case, we make purchase money loans toward local flips, and I argue that deferred payments make our loans safer.

Is there an alternative finance method to buy the property?