I've seen other investors buy out of the box short term rentals before.

If Indy has direct options and Knoxville is connecting, that would be another check in the Indy box, assuming friends would actually be helpful.But as others have stated, BRRRs are basically buying a flip and turning into a long-term rental.

Typically play to balance fresh design with budget is to source new doors and paint the boxes to match.  

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I would like to get a "Line Of Credit" and pay off my investor because I need get the AC replaced and Electrical Breaker box updated.

Just type "LLC asset protection insurance" in this forum's search box, and you will see dozens of threads on this topic. 

Why buy a box full of (serious) problems?

It checks all the boxes to be legal - 2 egresses, windows, 7' ceilings, bathroom, full kitchen, etc. 

There was no response and we followed up again this morning and asked if they found a secure place to leave the key or else we offered to send them a lock box.

Let me ask you this way.When was the last time you planted your butt next to the mail box when you got bitten by a rattlesnake hoping some doctor would send you a mailer on what to do when you get bitten by a rattlesnake?