But, that is a fat cash flow scenario and few people get that.

God willing, I will be ordained a permanent deacon in the Catholic Church this fall. 

The goal is to focus on growing our real estate empire and being able to retire permanently at 44 and 42.

With your loan amount it's likely you will encounter a full-recourse lender as most of the non-recourse lenders prefer loans above 1MM.Your friend has either cultivated relationships with lenders who will cater to his wants based on a long track record of permanence or he is playing in a deeper pool than you are currently where he has non-recourse options available due to higher loan amounts.I wouldn't put too much stock in what he said as it's more common to get a full-recourse loan than a non-recourse one.

And also, what would be the best location to make your signs permanent?

Lost my last job 3 years ago and have been unable to find permanent work.

You would not expect them to dig a trench or do permanent improvements.  

I've met with many landlords who have been enjoying big fat cash flows for 20+ years from that town.

On the other hand if you are seeking to buy and hold then you'll need more permanent financing.  

But the thing is making a "fixed" tiny house (on foundation with permanent utilities) is no different, building/zoning wise, than building a small 2/2, 1000 sq.ft., dual master, economy ranch... which is my plan.