Hey Guys, I've been making all my bevel cuts at first using a simple tool I made from a block of wood and now one I 3d printed from a file on Thiingiverse. That's the blue one in the photo. I use the razor with a dulled tip to make a nice clean score cut at the hinge line. Do this all with the foamboard laying flat as shown in the photo. I'm sure I'm not the only guy out there doing this. It is quick, easy and produces a perfect bevel. The blade is set to a depth just above the paper. Don't forget to use the Flite Test method to seal the hinge with hot glue. Hope this helps some of the guys out there who are new to building with foamboard.