The ARV should be around 950k and I'm planning to spend 100k on this.

If you are in the vacation rental business, spending even a nickel on SEO is a complete waste of money. 

Are there additional primary residence requirements such as homeowners exemption required, or anyone know if this is coming down the line?

Once the rep helps you with this, then you ask for their supervisor (since they make more money on having calls transferred) and promote how well that rep helped you; then, you ask the supervisor for the same thing.This was told to me in a seminar (a guru one at that); however, this is dependent on your personal ability to not spend the CC's.  

Additionally, they test to determine what sort of mold/s are present, so as to determine toxicity.  

I did not have much luck with traditional banks even though my partner is a GC and has done multiple additions and garages.

But STRs will be excited to get away from everything, spend time on the river and nearby skiing! 

Spend LOTS of MONEY on mass marketingThe "rate locked affect" is limiting a large portion of the market and stopping transactions from happening.

It can be draining if you work all day, then need to drive 2hrs after work and spend 4-5hrs working at the house and then 2hrs back. 

I understand the cost of having to separate meters and purchasing additional water heaters and such will be hefty.