Last year (or even 2013) there was someone who made a custom screen top for their frameless tank our of acrylic rods (I believe it was). On each of the 4 corners he attached a little square that held the top on the tank. The screen top itself sat just below the top of the tank so all you saw were the 4 little squares. If anyone knows of this build please let me know, Im looking to do the same thing. It may have been attached to a whole tank build.