Ha!
Yes we bought land in about 2007. Originally 34ac, now up to 75. Unincorporated Mills County, so very few regs. Probably the only real regs are requiring a permit for septic. That wasn't even true until a couple of years later.
We built a barndominium - the term didnt really exist then, but that is what it is. It was offgrid, but we got electricity a few years later. We still do rainwater collection. Propane, wood, and electricity for heat. It is a great DIY project. We had a crew pour the slab, and a local rancher and his welding rig did the iron framing. We put up the walls and roof amd everything else. Things get dried in pretty quickly, which means you can sort of build the interior on your own, amd leave building supplies inside pit ofnthe weather and away from minor thieves. We've had stuff stolen, but never a break in. Honor amongst the methheads.
Electricity: I built my cabin in the most private and prettiest piece. In retrospect I should have maybe prioritized access and electricity. You gotta have electricity. Maybe solar and batteries will be cost competitive soon. But the reality is the ac sometimes has to run 24/7. Without it, it's basically not habitable when it's hot. So a battrry bank is key if all solar. A big enough system that can run ac all day and still top off the batteries should probably be grid tied so that you are selling them volts.
You could run a generator, but that's noisy and can get stolen. Our little Honda 2000 was stolen. One small bedroom inside our cabin is insulated even in the interior ceiling and walls, so that we had a cool place for overnighter even in the summer with our little genny. If you are in the mountains and the summer is nice, and all you need is heat from wood or propane then maybe electric isn't so critical and a small off grid system would be easy.
It always made me wonder why rural folks will have a huge spread, but their house is 80 ft off the highway. That's because running utilities is expensive. My original quote from the electric coop to run a pole to my cabin was like 18k. More than the slab and metal building cost itself! That's for like 1100 ft. They only would do 1 "bend" of the line. So figure out where the closest line is. They later changed the cost to be more for the first and last pole, and less for the line in the middle. Thay brought the cost down to like 10k. We pulled the trigger. Call or email the coop- they should be able tontell you basic costs ahead of any survey. They said my neighbor had to approve. So we asked kindly. I'm not sure what I would have done if the neighbor said no. I'd have been screwed.
Access: the original 35ac crossed a creek. Now that I bought some more for the same neighbor, I could have avoided that. Not a huge deal, but it does require a truck or realish SUV to drive up to the cabin. Th3 creek floods sometimes, but usually not for a couple of hours. It's a recreational property, I just don't go up when it's that wet.
The county now has subdivision regs, for things like the size and access, etc. That would impact resale, if the resale market is looking at cutting things into smaller lots.
If you do a metal roof, and you probably will, then rainwater collection is easy. If you pour a slab, pour a couple pads for tanks. Locate them close to the gutter downspout. A single slope roof makes collecting rainwater easier.
We wired for both 12v and 110v. To be honest, I think I could have run conduit and just had a spiderbox for electric distribution. It's all in the walls now, but I worry about ever having to chase down problems.
Except for septic, Texas regs pretty much don't care about rainwater collection, solar, or in rural areas much of anything for building plans. County folks have never been to my cabin. But we are honest about the tax appraisal and anyway they use satellite photos to estimate buildings.