After all costs including a little extra for maintenance and vacancies, cash flow is about $100/month.

Just depends how much it'll cost to finish and how much extra rent you could get..Hope these questions help a bit!

If you turn over to a PM then they take most of the extra money you can make with a STR.So if you can self manage and you are ok with a little extra work then absolutely give it a try.

Here is my take on each of them:1) HELOC: a reusable amount of credit with a variable rate.2) Home Equity Loan: a 2nd mortgage on my home, only for the equity, with a fixed interest rate3) Cash out Refinance: replacing the current mortgage on my home with a new mortgage for 75% - 80% of the current value, and receiving the extra equity in cash.My specific question is, which is these is the preferred method when using the capital gained to begin investing with the BRRRR strategy?

@Austin SteedIf you can afford all the LLC's, the extra holding company is nice in case you get sued or audited. 

I know other then adding extra bedrooms, bathrooms, or increasing square footage what else do you do to increase value.From your experience do appraisers really care about when appraising your property?

This will give you some extra time.

They red-tagged us and we were forced to pay for plans to be drafted, approved, and several inspections before they permitted us - set us back several thousand dollars and an extra two months as a result - still, we were able to complete the project and still appraised for more than we spent.

They are not free but give you an extra layer of quality control and accountability.  

You can also pay extra to essentially turn it into a 15 year mortgage.Now on the bigger more important question.