Cutting Exact Sides and Creating Framework: Decide on your overall design. Mark out one side and cut: Flip that piece you just cut off into the reverse position on the other side and make your etch and break 'er off: . . . . and POW, you have a symmetrical piece: Now, let’s hollow that bad boy out for some depth. Start by using tape or other object to map out your sides trying to keep them all the same distances from the edge: Now, drill all your corners. This makes for a stop for when you begin cutting as well as gives you a rounded corner: Using a straight edge, begin playing connect the dots with your holes. Scribe at the outer edge of the holes: Here's the part once you've scored you edges: ....and here's the first part of this panel. (BTW, this is not actually for any particular project, it's just an example): If for any reason your cuts aren't to the outside, you can still go in and trim away at it with a knife.