Private Lending Attorney Here-First it depends if the person lending the money will be doing this on an ongoing basis - if so he may want to have a separate entity created for that business.As far as documenting the loan - I would recommend speaking with an attorney who regularly handles these transactions. 

With and average occupancy ranging around 60% (depends on your product) the earning potential is high.

No right or wrong answer, it depends on how savvy are you at renovating, how long do you anticipate on house hacking?

It will all depend! 

It depends on which lender you go with, fees can vary. 

Hello Kiefer,Two weeks is not that long of a period, depending on the area, that may be lower than the average days on market around there.

depending on the amount we're talking about, have you looked into using a true private lender for this one?

There are ways to deal with these situations, and it depends on the property and the lien holder, but it's possible to do some pretty incredible things if you are willing to invest a little more in legal costs to close the gap on your losses.  

But if they insist on paying a percentage, then it depends on if the GC is paying for everything?

It also depends on the warranty company and your policy.