I finally decided to apply what I've been learning about, gassed up, and got to to know a neighborhood a little better.

You probably won't be able to rent it seasonally if you plan to follow the 6 month > rule. 

Repellents containing DEET (N,N-diethyl-meta-toluamide) typically used as mosquito repellents are also labeled for use against no-see-ums and can be applied prior to exposure to the biting midges.

Caveat...all depends on what you know but with the 50% rule showing negative, the need for you to dump 72,000 in it,  and your optimistic outlook only showing 6%, i'd park my money somewhere else and look for something better.  

I'm inclined to lean more towards the idea that that's the exception to the rule, but it certainly shows that outcome is possible.

Would I be wrong to take 3 or 4 similar properties (1 story) and determine a $$/sq ft and apply that to the 4000 sq ft of a two story AS A STARTING POINT ?

Rules like the "2% rule" often force you into 20k rentals.

Yield maintenance applies n/a Is there a maximum loan term?

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If I apply the $30k LOC to the mortgage principal, the total interest reduces by $63k to $41k total and the mortgage is paid off in 17 years. 2) If it takes me 10 years to pay back the LOC, the interest paid on the LOC will be $10k. 3) If I just make an extra $300/month principal payment, the total interest on the mortgage reduces to $47k.