I have built 9 cabins of various sizes, materials and types over the years. I own 2 now. One is a gettaway cabin in the woods. It is 12 X 14 with an attached wood shed. Some of the best times of my life was spent there. Cozy and with a steel roof, I can almost hear the rain pitter patter on it yet.
My main cabin is 24 X 40, with a full basement which I keep 20 cords of wood in for winter and my canned goods.
I have built bigger cabins with the only problem we found was we had to add upright support on a wall that was 60 feet long to prevent it from bowing out. That cabin was made of logs squared on 3 sides and drilled for and assembled with 16" dock spikes. It is a 2 story cabin built on flat rock.
One small cabin was built the old fashioned way with logs peeled, notched, and rolled into place. The logs were then chinked. It had a loft in it and a Franklin stove. I can remember one night in winter listening to the wolves howl outside the door. Or in fall listening outdoors under the pine tree tops and hearing the wind whistle through the wings of low flying geese. Nothing like it.
Sorry for rambling. My suggestions are to build what you and a companion would like and go do it.
You will find much work and pleasure in what you build yourself. Plenty of folks to help you out here.
Best of luck.
The Hermit