I am getting prepped to build a Log Cabin in the North GA Mtns. I want to run MOSTLY 12v throught the cabin. Can I wire the cabin with standard 12/2 wire and run 12vdc. Is there any voltage loss over solid copper opposed to braided wire?

I would like to wire the house to where if ever I went to sell the place it could easily be converted to 120vac with the changing of the plates and light bulbs and the breaker box.

I am thinking I can run everything off Gas or 12vdc except a washer and dryer and the Air Conditoning... But the house will be spray foam insulated so it will be extremely insulated so won't use to much energy on A/C anyways.