And if you need to rent in short term, that's fine too.  

The rest will be leased.How do I determine and analyze a potential location for this development in terms of potential lease rates, vacancy rates, potential area growth, post construction value, etc?

That will help determine if Short term capital gain (ordinary income) or Longterm capital gains.  

Takeaway is having at least 1 medium term guest will yes have lower rent potential but less headache and helps stabilize income.Gross Earnings: $2,200Expenses: $75 supplies (we clean ourselves, takes 10 minutes, and it's right upstairs no biggie)PITI: $2,700We paid $800 including utilities and any little repairs needed to live here.When we move out, we expect to cashflow around $500 a month conservatively.

Fannie/Freddie have more restrictions in terms of experience and net worth to qualify.

Which one (usually, and I understand it's not simple) has a better resale and long-term potential?

It will also depend on your goals short and long term and why you're investing. 

Short-term goals might include acquiring your first property, learning the basics of property management, or networking with other investors.

Originally posted by @Brennen McConnell:The suppliers say they are familiar with building codes in the US, but I still imagine there would be a lot of work to ensure code compliance, as well as installing the home on a new foundation, connect to utilities, etc. 

Try a long term lease option.