Step 3: Step 3 - Create a Place for Your Treasure Chest Lock
So I wanted my treasure chest to open from the front side, not the top like a box. And I wanted it to have a little lip where I could put my "lock". I noticed the long flaps of my walls overlapped and decided to cut one off. It seemed wild, but trust me...
Cut one long wall flap along it's fold line, remove. My cut wasn't very neat so I decided the rough edge of the severed flap would go on the inside and I would use the nice box factory cut side as my lock edge.
Placing the severed flap down on your cutting mat trim off the rough edge leaving approx 1 inch of material.
Place one strip of double sided tape along the bottom side of the new 1 inch flap. (I put the tape on the bottom of this flap so the front of my cover would have a smooth edge). Burnish the tape with the smooth bottom of your box cutter, remove the backing and add another strip to completely cover this bottom of the new flap with double sided tape (if you are using 1 inch double sided tape you don't need to repeat this, I was using 1/2 inch). Burnish and remove backing.
Tape the 1 inch flap of the severed edge onto the top of cut edge of the remaining wall fold. See photos, you now have a long domed cover that opens on one side.
When you hold your cover closed you'll notice there is an "overhanging lip". Holding the cover shut, use your sharpie to mark where the front outer wall meets the overhanging lip underneath on both sides. Flip your box over on to the mat cutting board, use the L ruler to draw a straight line connecting these dots. Use the dull side of your box cutter to perforate this line.
Now when you close your box you can fold the overhanging lip down and have a place to "put your lock".
Hooray, it's starting to feel like a treasure chest!!