Nice thread topic. I used to be a custom home builder. I specialized in spec build modern-rustic style.
The homes would have the look and feel of a rustic cabin style, but completely modern build qualities like 8" walls, spray foam insulation top to
bottom, geothermal heating and cooling with radiant heat in floors, 2x10 acid patina pine siding. Built like a brick.
You could easily cover materials with that price point and hire a couple laborers with you guiding them.
The most often overlooked expenses in this type of rural build are always site layout, in my experience.
Road/driveway building, even with gravel, is extremely expensive, when built to last. As well as running utilities back to the property.
Dirt work is not cheap either, so make sure drainage and a flat lot is available, and as close to the road as you could get.
I am doing an off grid next summer in colorado, if plans continue as planned.
The cheapest type of build I have done was an a-frame similar to this. Minus the log material, drywall interior, fur trusses and loft.
Major cash can be saved by building on piers vs. basement or slab and you only need to snap out your corners, auger holes, set posts and add as needed
for spans that floor joists can hold. Laser level and chainsaw tops even, and start your floor.
Sounds like a fun project.
The reason I would only build a small off grid cabin at this point is because there is so much inventory around.
If I wanted to do what you are picturing, I would find a field with a barn that has good framing to it and go from there. You would easily cut that
price in half.
Wrap it, side it, roof it if needed, insulate, wire, plumb, drywall etc to get it finished and habitable. Deal with a materials supplier that will
show up a deliver it all in one shot.