Unfortunately, one has to say - the whole thing seems to me more like a fantasy construct than a somewhat serious cost estimate. This way, one can only experience a total financial and performance failure. You really have to make much more effort to get a realistic cost calculation.
We have a construction boom - and no one has anything to give away. Find a professional or dive deeply into the subject yourself, then you will realize that the [Luftschlösser] you have calculated so far are just castles in the air.