@Gareth Meaker Welcome.Your list is too comprehensive right now.

-Developing (or buying) comprehensive lease template, building relationship with Real Estate Attorney.

If you enter all the information, it takes a bit of time but can be quite comprehensive. 

There's lots of things that impact a short-term rental's performance and value that won't fit into that calculator, such as how many it will accommodate, does it have a view, proximity to attractions, are the roads difficult, etc.  

Pretty difficult to do both a comprehensive overview and an in-depth look at investment strategy.

Is there a comprehensive list of states where this type of transaction is or is not legal?

@Jon Holdman wow, that’s very comprehensive, well rounded response!

Your joists in the ceiling most likely go sideways across (and are likely on 16'') so you will have to bump out around 3 feet to accommodate the ducting going up/down and frame around.

Just keep in mind that often the names they use may be different than what local operators use.I also like the HUD comprehensive housing analysis reports.

I think as an investor it is important to accommodate these people in my income properties.