About two years ago, I ran across this really interesting construction method called Grid Beam, basically adult Construx or Pipeworks. Their website is hilariously 70s-ish http://gridbeamers.com/. It’s such an incredibly simple concept that I can’t imagine why it hasn’t picked up with DIYers more. I eventually bought a book on it, it’s floating around my apartment somewhere. The book goes into some tricks and best practices that are kind of neat.