That is a lot of great progress. We built on a slab as well, and I really like it. I did it because of the humidity we have during the summers causing moisture issues in the crawl space. Like you I was surprised at the speed in which the electric company got service to my house. I'm only 990ft off the road, so they installed an in-ground substation and ran power from the road in the ground. They only charged after the first 300 feet, so it wasn't that bad. I have 400amp setup on my house as well, and according to the electrician it was the last 2-200amp boxes he had, or could get. I can't believe it is getting like that again.
Your land leveling skills are awesome. As soon as the farmer picks the beans I have about 10 more acres to mow, so I hope I can get my land close to yours. I hate cutting a bumpy yard.