Step 3Cut frame sheet pattern
iImage Information

On the ugly side of a large piece of cardboard trace out the cutting lines with a marker or pencil. We consider the ugly side the one you don't want to be seen on the finished couch. For us that was the side with any left over tape or logos. This can help by being folded under the base of the couch. For drawing the curved surface, we had one person lie on the floor in a position that they would like to sit, and then the best artist of our group drew a rough curve. (note: when you cut with the exacto knife it will essentially smooth out your curve. So the drawn line is more of a guide) Don't worry about the markings being unattractive because these will not show on the finished couch. Cut out your frame sheet with an exacto knife.
Cut a frame piece with an exacto knife according to the schematic below. Trace out the beam slots using the schematic below as a guideline. Following the dimensions exactly and spacings of the beams isn't critical, just work to make each beam slot a nice regular rectangle. Then cut the beam slots out slots.