DSCR loans generally require 20-25% down.

HELOCs are generally provided to properties that are held in the owner's personal name.Are your family members not interested in refinancing the property?

There is no general rule of thumb but you can expect it to be in the range you have listed above.

The flat fee buyer agency fee reduces the amount of the buyer credit/refund, generally by $6,000 (although options range from $999 to $8999, depending on how much help the buyer wants from the agent).

A STR will cashflow better than a LTR (generally). 

Generally there is no immediate tax implication to doing this. 

State average homeowners insurance rates indicate the risk of natural disasters.Information Sources for Data-Driven Decision MakingUtilize these resources to gather the necessary data for your city selection process:Population Size and Growth: Wikipedia's Metropolitan Statistical Area pageAppreciation Rates by Zip Code: Zillow ResearchCrime Rate: Avoid investing in cities on this list.Comparative Homeowners Insurance: ValuePenguinProperty Taxes: LendingTree (as an indicator of overall operating costs)The Importance of Local ExpertiseWhile research and data are essential, remember that general knowledge only goes so far.

Is anyone actively doing midterm rentals in this general area and willing to help some new comers out?

There's honestly good, general advice above, but the answer to your question is really simple. 

We'll see real supply greater than real demand.Every local is different obviously, but I am talking in general.