The one you mentioned is a great example of what we are going for and extremely similar in the distances and ratios (ours will have smaller units, which would typically be allocated no or a tiny yard anyhow).

Be ready for a list of deferred maintenance though,  when people pay tiny amounts, they won't  tell the landlord about anything because they fear rent increasing- but when they are paying more (even below market rate), they want stuff fixed that they overlooked for likely years. 

anyone into the tiny house real estate market?

During this period start taking tiny steps (others say TAKE MASSIVE ACTION, so the magnitude is all relative).I say take tiny actions such as attending a MeetUp while you read books about Real Estate or listening to podcasts.OH, your question? 

I live in a tiny town in Northern California, so I have accepted the fact that I shouldn't limit myself to my geographic location. 

Any tips for first time tiny-house builders?

May require a tiny bit of creativity.

When we were contemplating setting up our tiny house rentals, it was scary because we had no idea if we'd get any bookings.  

So just volunteer, or get paid for work done, or take a small (even tiny) equity stake. 

But remember even those interested are on 1000 different lists and are getting giant piles of mailers.I'm shocked any time anyone tells me they're even a TINY bit effective.