Has anyone ever made their own outdoor hottub? I'd like to put in a small hottub, doing the framing, plumbing, concrete board and tile myself. I don't want all the fancy jets with bubbles and all the bells & whistles, just space for a 2-4 person heated outdoor pool. I've surfed the web and couldn't find out much info on why this isn't a good idea. So let me know if I'm just dreaming, but this doesn't seem that complex....which means I'm probably missing something.