The long term rental works well if you can float the first 1-2 years.  

My call with any banker ends when they tell me there's a rate for the build and it floats until completion.

The planks do not stick to the floor but to each other and float on top of the floor.

Saniflo is the one I've used but I'm not pleased with the longevity of the float mechanism if it sits unused too long, or the macerating jam sensitivity to any small items, grease, hair gel etc flushed.

Otherwise there is just a bunch of info floating around in your head, and you don't know if you missed anything important.Here is what I recommend. 

I had rented the same place in Hamilton Mt.. for our annual Salmon fly trip and what was a decent place at 125 a night was now 300 at that price hotels are better option since we dont cook in the unit anyway.. so not sure if they rented their house never checked back in but for sure noticed it.My daughter bought a floating home on Puget Island this year and she is doing very well.. especially for the salmon runs.. then she has kyackers etc but she is pricing it to stay full. and its cute as hell.. plus the fisherman can park 2 to 3 boats and parking for 5  trucks etc which is a premium.. so its just one of those one off ones.. we have a place facing the deep water river with a dock have not tried to rent it yet maybe we will. 

Quick question for you guys -So I know this isn't a new idea, and it's been floating around in my head for a while, is there a need for a good virtual assistant for vacation rentals? 

Some initial thoughts / how I looked at things: Financial Stability --> could I float minimum of 3 months comfortably if it was not rented? 

Wix has been great for me in terms of a website and Canva is then free to make basic but decent content for posts, stories, banners, ads, etc.

I recommend floating interlocking LVP, not glue down.