Hey I currently live in a yurt in a small town near Bangor. Space wise it was a lot cheaper than a similar sized cabin. It got permitted as a raised camping platform, really no issue with permitting. This is a small town with a really relaxed view on code enforcement though. We were told to start building, by the code enforcement guy, even before they had approved us.

If you have any questions or want any information I'd be glad to answer!