IMO you will end up living in it and never build or start building and not finish what you want. Have seen this many times over. If your serious about building, buy a nice used Fifth wheel or similar camper. More economic, easier to move and it forces you to get the ball rolling. Then it has dual purpose after the fact, and easier to sell.
If your rural and have room build a nice garage/ barn/ shop first. You can live in it while building house. Then have room to do your milling, wood work, and storage of materials. This is the route we went. I built shop first with RV. Then RV Hookups on shop for power and water and septic dump tied into septic tank. Shop also gave place of refuge to get out of camper. Now in house and have a great shop to work and store equipment. My 2 cents.