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We had an idea about doing the floor. We may do it in pen units, like building a raised bed for each one, one at a time, putting bracing/joists and laying plywood on top, voila, instant pen floor. That way, the irregularities in the pad will be easier to deal with. And we can lay the plastic and anti-dig wire (just an extra layer of protection in addition to the concrete apron we poured around the perimeter) under each pen floor frame as we go. I hope this is clear. Seems like a manageable way to do it rather than try to do a 20x24 floor. Each unit could be bolted to the next if need be and some will share walls, of course.