Looks like an awesome investment and home!

1st, lets talk about equity in your homes.

Pays only 8.5% but is the most conservative note fund we have ever come across as they only do performing notes that are in first lien position and only on homes that have a mortgage under $600 and people have at least 50% equity in their homes already.

We own our primary home in the Portland area, and have had an STR condo in Seaside OR for 2 years.

There are new construction homes about 2-3 miles away going for 190-200,000 but I think they may be a bit larger than what I am building.

A $400,000 home should rent for $2,000 or more, and shouldn't need $600 in monthly repairs. 

Correct, a foreigner can get a home loan with a bank institution in the same way a national would.

the way to go about it is turn it over to your insurance and get the police report.. sometimes insurance will then subjugate the claim and go after the tenant criminally I had that happen on one of my rentals where the tenant did 40k in malicious damage on a new construction home I purchased in MS. 

They had an unfinished space counted as finished space increasing the size of the home by ~10%.

Find Brandon's videos on YouTube for the "four square" method of analyzing homes and practice.