Only issue is you have minimal insight on monthly performance unless you download the bank statement and then build custom charts in excel or google sheets. 

Even if you could count on the 5% increase per year you mentioned, I would be shocked if your taxes and insurance increase per year was less than that.Roof 2 years old might need to be replaced within 10 years, water heater and HVAC may not need to be replaced, will sill surely need a number of maintenance events, ...all of which will increase your cash costs, and delay the cash return. 

As for the interest rate, it does help being 0% minimizing the cost but even if there was an interest rate, as long as you have enough room on the cards to float, it's not your money you are spending.

Your best bet is to ensure that there are no material modifications that would in any way harm or even moderately delay the ability to rent it out and qualify as a normal SFR (one lease, one family) or sell on the market to an owner-occupant

Corporate formalities are taken care of and minimal as a single member LLC.

They seem very similar in that they handle emergency and non-emergency maintenance calls and, critically, even dispatch contractors/service-people with minimal intervention from me.

There are two main pathways for this - Delayed Financing and cashout refi's. 

Additionally, consider negotiating the ability to delay or cancel some bookings to complete the necessary work sooner, avoiding further damage.

After we paid him our nextinstallment of $45K, he basically disappeared in July and after reaching out tohim and his wife who also works with him, we've gotten minimal contactback/excuses/delays of when the final work is going to be done.

And, due to the arid environment, property upkeep generally remains minimal, saving on both time and costs compared to areas with high weather impact.Moreover, the mid-term rental (MTR) market in Las Vegas presents a significant financial upside, often doubling the rental income compared to standard long-term leasing.