Looking great. You did not mention a floor drain. You might want to consider putting a bulkhead overflow on that rubbermaid tub going to a drain. Also it looks like that tub is sitting directly on the concrete floor, this winter alot of heat will go out the bottom, maybe you could add a sheet of foam underneath. You could also consider making it to where your skimmer would over flow back into the tub if it overflowed. Also, 15 dollar flood alarm is money well spent.Just some thoughts on flooding. Something I don't like to think about, but I have ruined a couple of floors etc : )