my best friend used to vacation in puna and told me i'd love it there. have been studying from afar. www.hawaiiinformation.com/REsearch
shows a choice of 82 fee simple minimum 2/2 single family houses on at least an acre there, each of these under $300k. some of them brand new. i can't tell but from the pictures the construction does not look all that robust. i assume it is adequate to the area.
there's an section of puna called hawaiian paradise park which looks interesting. also i think the northeast section of that is within a 30 minute drive to hilo, or at least so some houses for sale advertise. i believe they have electric, some have water and others without water collect in holding tanks. supposedly it rains enough during the night there so that collecting water is not a problem.
sorry to read in your referenced materials about the development there. oh well, i wonder if there is any good snorkeling in montana.