Quote from @Aaron Dubois:
The Geodomes and other smaller structures seem to be the more cost effective strategy. The area I'm looking at seems to have high demand without being overly saturated yet, at least compared to Joshua Tree, Gatlinburg, Moab, and other hotspots.
I'm still crunching numbers though, and if anyone can point out a flaw in my reasoning I would be grateful. I came here for the deep well of knowledge and experience that members of this community have.
The Geodome structure itself may not cost a lot, but I think you are greatly underestimating the time and money that all of other aspects will set you back . . . Land acquisition, permitting, grading, hardscaping, wells/plumbing/septic, electricity, shared recreational amenities . .. The list goes on. Plus the furnishing costs of a bunch of smaller units. I'd be surprised if you could get a project like that going in under a year. Unless you start with a property that has that infrastructure already in place, where you will then pay a premium for that.
I don't think that your idea is bad on its face and destined to flop, although I do think it is risky given your lack of exit options and timeline. You are also jumping right into the deep end instead of learning the game with a smaller property first. Maybe look for a campground or mobile home park that has some of that infrastructure in place where it will be relatively cheap to add the geodomes? Might be tough to find in Sedona but there are plenty of other areas out there where this could work.