And also, what is the time frame? 

The turn key providers have moved on by the time these issues manifest themselves. 

Joints can loosen over time and create an arcing problem.Running wire isn't all that difficult if 1. you have an open attic that the wire runs through or 2. you plan on removing lath and plaster anyway to go with sheet rock.

SO Who can get value from working with a small-time "arbitrager"?

My worry is the 5 years pass and the balloon payment comes due, and now I am stuck with whatever interest rate is available at the time.

Closing costs on the refi will be 5k let's say so that goes down to 65k let's call it and that goes back to your parents who by this time have gotten their 15k back from the contracting and are only left in 60k. 

That severely limited the number of lenders I could go to, so I ended up finding a loan product (that costs a premium, albeit) thru Velocity Capital Mortgage that allows fully-amortizing or IO payments (for first 10 years) which will help me build cash flow and accrue title seasoning while I find the right time to pull the trigger on a fully-amortizing DSCR product Did you work with any real estate professionals (agents, lenders, etc.) that you'd recommend to others?

Needless to say, multiple times they were not able to pay and we had to use all the reserve funds and sent them notice of non renewal.  

Flooring: A lighter or mid gray lvp to compliment (~$3 sq ft material) Cabinets: White shaker style (Lowes/Home Depot, Readily Available with little lead time) Countertops: White Quartz with black veining to match black matte finishes if the return on investment is there or just a nicer laminate (calacatta marble natural stone look)Finishes: Black matte for a modern look or the classic brushed nickel.

In short, getting the capital needed is possible, but doing so will take time and effort.