It comes down to comfort level and risk tolerance ultimately. 

The numbers do not measure the risk because everyone has a different risk tolerance you are the only one that can decide if this a good fit for you.I have taken HELOC's against a rental property to fund other projects, typically new construction deals, but have never pulled money against my primary.

@Robert Regis The answer to this question depends on your strategy, timeline, risk tolerance & how much capital you have access to. 

It all depends on you , your goals , and your risk tolerance 

So, just know what those costs will be.Regarding the bathrooms, you will have to do your research to see if the Tenants in the area tolerate sharing bathrooms. 

My risk tolerance is pretty high btw

However, that’s really a choice you will need to make based on your preferences / level of risk tolerance.

What is your overall risk tolerance?

As you mentioned, it all comes back to your tolerance for risk.

If we were sharing a beer, I'd ask pester you about your risk tolerance, stress levels, how much can you do or leverage out on before it adversely affects your family life or sleep... and then buy another round.