You brought up a couple of good points. I did not think about the effects of saltwater on exposed metal. I can always replace the test plug with a permanent one. Also, the skimmer will be in my basement fish room (concrete floor). I am trying to figure out a way to plumb the skimmate to my waste pipe, but I don't think I will be able to make it happen. So, it will probably go to a 5 gallon bucket that I will have to empty as necessary.
Thanks for the insight.