I would love this as well. There is a lot of ready made tech for off grid living these days. E.g. you can buy an island capable solar+storage system from many

I would love this as well. There is a lot of ready made tech for off grid living these days. E.g. you can buy an island capable solar+storage system from many vendors, not just Tesla. You can buy very efficient and clean log-powered heating systems. "Stückholzheizung" in german. All the components are commercial off the shelf. So you only would need a prefab house contractor to combine these offerings into a good package. Add in starlink, and you can indeed be completely off the grid, even including WIFI. The biggest obstacle for off-grid living is legal. E.g. in Germany you can not opt out of grid connection charges, even if you do not use the grid.