Theoretically yes. Keep in mind that building up usually also means retaining. Retaining the two sides of the street with L-shaped stones will already run into five figures.
Too many variables, you have to check on site. Anything between 20-100k is possible
And we're talking here about 2m L-shaped stones all along the full length. That's too much for a little embankment.
Does the development plan even allow that?
Oh, good soil means Z0, with Z 1.1 it can be twice as expensive, and so on.
Just tell me how much money it would be worth to you to have a straight plot, so that your pain threshold is known to judge whether it makes sense to continue writing.