My sister wanted one all her life and had one built in the Smoky Mountains. She had one of those log cabin home kit deals and hired a recommended contractor to build it. That was about 15 years ago, and it's been a disaster. She had to fire the first contractor because despite being recommended by the kit maker she said it was obvious pretty quickly that he had no idea what he was doing. She hire a second contractor and he did a better job but the problem was these kits homes are still basically a model kit, and like those of us who build model kits know, nothing ever goes together as smoothly as it shows in the directions.
Her house is like a freezer in the winter because of all the gaps between the logs that have opened up over the years. Even sealed wood expands and contracts, which causes gaps in the seals. And when the wind blows you would swear there's about a hundred people whistling all around the house.
The floor plans are kinda quirky too, and that can be a PITA too.
What she has figured out is she would rather have a house that looked like a log home rather than an actual log home. She figures had she gone that route (build a conventional home, then have timbers attached to the inside/outside walls) it would have been more expensive initially, but factoring in the costs of re-dos and repairs she has had to make to the house it would have been cheaper in the long run. I told her 15 years ago there's a reason why pretty much everyone in the country quit building homes out of logs over a century ago.
On the other hand, my father-in-law built a three-bedroom log home in the mountains in western TN a couple of years ago, and it's fantastic, but... he didn't use a kit. He used selected hand-cut and shaped logs from Amish mills and he's worked with wood and been building stuff all his life so he knows exactly what he's doing. He said he would never try to build a kit home for the very reasons my sister discovered.
