Settlers of Catan and other board games based on tiles often fly apart. I made an acrylic cover to settle the tiles and keep the other pieces in place.
Step 1: Mapping Out the Space
Assemble the game the way it would be when you use it to figure out the way it best fits on the acrylic sheet. For the same reason that motivated me to build this, I found it helpful to tape the outside edge down: otherwise the pieces move around.
The piece of acrylic I bought was just smaller than what I really wanted, but it does the trick.