That is a huge amount of time to research all the aspects that you presented. 

I did a quick review of Furnished Finer in Midvale, UT and it looks like your price estimate is about in line with the market but there is of course a bit of range depending on exact location/level of furnishing, amenities, etc.

Are there any specific considerations or legal aspects I should be aware of when making this transition?

On the other side many major companies are investing in Austin so growth looks strong in many aspects.

The income aspect is a little different though, because you will not be able to verify, or they may not show income on their application if they don't have any. 

Now I gotta figure out this refi aspect of the BRRR method.

You can try to use their taxes for verification but it is still difficult, CAP rates will not reflect tenants that need to be evicted.Hopefully, this has been helpful in providing some additional aspects that are unique to CAP Rates and Mobile Home Parks. 

Private financing or hard money is generally used for acquisition and rehab financing for properties that won't qualify for more traditional loans, when speed is a priority, or when some other aspect will roadblock traditional underwrites.

I have a few other quotes for STR coverage that don't look bad but not as fully loaded as Proper and many of the business aspects of a STR.  

Do transfer direct to avoid fed 10% withholding.My CPA does not want to assist me in any aspect of my Solo 401-K.