We had similar situation on a similar year house and once we exposed the pipe, we ended up chasing the crumbling pipe 15 feet down the rabbit hole.

I've been slowly reading about and exposing myself to Real Estate Investing and I'm motivated to learn more about it. 

@Donny Dormady Considering the fact that you live in Alaska and the entryway will be exposed to moisture, I would go with a good commercial-grade vinyl plank as @Nathan G. suggested.

Fir out exterior walls to fit a r-19 batt in cavityAs for the heating I am in between forced hot air (propane) and electric baseboard heat.  

Are they doing everything they can to expose properties to the widest possible market?

Ownership of a home carries liability risks which could expose all of the assets of the solo 401(k) to creditor attack in the event of an accident at the home and a judgement that exceeds the amount of the liability insurance policy on the home.  

Are they doing everything they can to expose properties to the widest possible market?

Because you have different strangers staying in your STR every few nights, you are exposed to an enormous amount of risk (e.g., property damage, an incompetent guest leaves the stove on or the property unlocked, a guest brings a child to the property who hurts themselves and the guest files a lawsuit, etc., etc.). 

However, the ceiling is unfinished and has exposed wires not in conduit and ductwork running everywhere.

Are they doing everything they can to expose properties to the widest possible market?