Please read everything again. Regarding my note about the construction power box, which you somehow overlooked, someone has already mentioned something about it above.
Nevertheless, I believe that you and the web have no idea about craftsmen's prices. I have little knowledge of the trades (for example, what a shell construction costs), but I know what I myself have already had to pay, for example for floor coverings. Every little thing has to be paid for, even a masonry stair railing. Costs for the house without ancillary construction costs: at least 400,000. P.S. The load-bearing capacity of the building land is not determined by a level or a new development area.