Or any thoughts on a good resource for how to lay out the terms for owner financing for something like this? 

In the last ~2 years we have upgraded ~220+ units and our flooring in the bathrooms has always been either TrafficMaster Allure Vinyl Plank (the stick down flexible product) or 12"x 24" Porcelain Tile all depending on our budgets/community demographics. 

The rep at Home Depot said you don't need any particle board or U lay installed underneath the vinyl plank flooring.

In Eastern Europe there were bathrooms in homes where the entire floor (plus most of the walls) was tiled like the shower, leading to a drain in the middle of the bathroom, meaning a shower curtain is a matter of preference (some people like to keep the steam in, or might have bathroom electronics out on the sink, but it's not considered "necessary" as it is in our "standard" bathrooms), so this isn't even necessarily limited to folks from the "3rd world."

When I left CA, I rented my house out and subsequently rented a place in Denver while I figured out the lay of the land & decided where I'd like to buy.

I’ve explored some options there over the last few month, mostly through LoopNet, to get a lay of the land.

(Normal $2,700)Tile floor done right, $750 in material(more if you buy the $100 tile cutter).

I just went to a B/P meet up last night for Air BnB, I am looking into that route too, but for now I am going to lay low and continue my R/E licensing exam and wait for summer to pass...apparently it can get real expensive this time of year. 

You can do that too, just be prepared with a storage space/warehouse or to get lucky on a lot of material.It's easy enough, just follow back from the guys that buy a lot of material in your area to the distributor to the manufacturer.I listened to a podcast one time with a guy who was rehabbing 100's of units of apartments in Texas and he started his own wholesale building materials company and was buying containers of vinyl tile from China and was selling to other apartment rehabbers in Texas.Could you do this?

What if there is a fire and someone is found dead laying by the front door?