My husband and I weren't satisfied with RonnyLULU's version, so I tweaked it a fair amount. I'm still tweaking it. We eat a lot of boxed cereal and get things in the same-ish thickness cardboard, so we have a lot of that sitting around, for just such projects as this. I gave clearances at the fold points for thicker media, as the V-points deformed the cardboard we originally used (I think it was a UPS corrugated box). The photographed box was using a Totino's Pizza Roll box panel. The oval window is on a separate layer which I haven't yet printed out, because of the box's stability. We might lengthen the tab a little that tucks in to secure the bottom, and it will need a dot or two of glue.