Made a $2 bezel a few months ago, roughly following that guide... except it cost even less, around 50c. Only needed a single sheet of card / poster board.
Once it was right, I used staples, in behind, to keep the tabs together. This looked even better than I imagined it would. The tabs and staples are completely invisible when bezel is installed, and made the finished bezel feel a lot more resilient too. Used one of those tiny office staplers, a few per tab join.
Used a little PVA glue (for wood & paper), no staples, for the main structural tab connections (around the edges/corners where the sides join). These must sit tight and flush under glass or metal, so staples wouldn't work.
http://forum.arcadecontrols.com/index.php/topic,166352.msg1765519.html#msg1765519