The floor is very flat and smooth as can be. The fellow running the job is 79 and still going strong, you can see him in the center of the first picture. He and one other fellow did the finishing work. Wax on wax off came to mind as I watched. They had sleds they used for their lower legs and a trowel in each hand. I rinsed it off this morning after we sawed some grooves in it to forestall cracking. By looking at it as it dried, at most there may be an area or two that are 1/16 off, it's really quite amazing. But then that's why I didn't want to do it myself (not to mention it's just too much work for this old fart and a few of my friends).
There is 1 inch of fall from the back to the garage door, in 32 feet.
Bob, This will be the third and last outbuilding, I have an 11 X 22 that is my present workshop, an 8 X 15 that is my R/C hangar and tool storage (way too small). Also, no kids walked on it and I kept all three cats locked in the house for 24 hours, much to their concern.