Nice job! I have mine on a concrete slab, but it was existing (part of the driveway) so I didn't have to pour it. When we move, I will have a pad poured with a proper drain system. I still think that concrete is one of the best to control weeds and bugs, but I have a double layer of back support padding on the floor. Concrete is hell on the back.
It also makes for easy cleaning. I bleach the floor at least twice a year.
