I saw the topic and my thought... Oh I have some thoughts on tiny homes alright!! Be careful what you wish for...

I'd tell you this.... don't take advice from someone who hasn't lived in one....
No offense to those offering help.... everyone means well, but first hand knowledge is more important..
It's not the house... (cabin.... they were called cabins for hundreds of years).... it is the actual living in them..... I'd get on some homesteading sites and look at lifestyle rather than optics of square footage or materials.... those are just marketing tactics..
I lived my first 6-7 months in AK in a converted 10x10' chicken coop....
living in small spaces is a learned thing... buying is one thing.. existing inside one is another....
My first cabin on my land was 12x12'.... that is the dimensions empty... you start filling it with counters tables shelves and "stuff", and that number means nothing... my cabin had about 6 feet from my bunk to the counter... and about 9 feet from the small table on the south wall to the wood stove to actually move around in...
I'd be less worried about the building itself.. anything will do... I've seen everything you can imagine... (Including a house of blue tarps).. it's how one adapts to those conditions...
It's not easy.. I've been doing it for nearly 20 years.. I went from a 12x12'... added on 8 feet.... after 10 years or so... It was palatial... for about a week...

I'd bet all those people/companies who build those things all live in big houses....
I'd listen to those (online?) who have actually experienced it.... like I said... you actually have to be able to live in the thing at the end of the day....
Personally I think it may be a good idea..... but it not necessarily an instant solution.... but just don't jump into it.... the most important thing this former flat landed did when he got to alaska was to listen to those who came before me... (not meaning me.. in this case)... but take advice from a base of knowledge....
sorry.... I'll get off my soapbox.... I have to get into it and get some toilet paper and it's also my coffee table and step stool.....