Since your planning to pay cash, if you use hard money you can spread your money out to multiple assets in a short amount of time faster, however if you pay cash you can have better numbers and make higher offers and of course get better deals (just wont be as fast to scale since your money will be locked up for seasoning).

What happens in the reverse situation?

Financing is a different situation when you have entities involved, meaning that commercial loans need to be used rather than what you have already experienced with a conventional, FHA, VA or other "regular" mortgage. 

It really depends on the neighborhood, the type of tenants you have (and can attract) and what the financials look like on whether this situation was worth it ten years from now or not. 

I have a complicated situation in showing proof of income, however, I have a great credit score.

Assuming you are the owner, what would you prefer in this situation?

What is the supply and demand situation in Las Vegas?

I dont necessarily need to borrow money but isnt it the financial liquidity/situation of the US based/registered company that determined whether banks can/will provide mortgages?

This simple chart shows the PE multiple difference/spread between SP500 and US Equity REITs, typically REITs more expensive than stocks but now at lowest level/price since GFC-2009, so from a relative value perspective of where to invest a dollar, this is a great time to invest in real estate, thinking long term.

I've helped a couple of my clients with house-hacking, and I am happy to share a few analyses we did and see whether the numbers make sense for your situation.