At a minimum you will need four 3 inch by 4 inch rectangles of the circuit sheet to form the billfold area. I only carry a few credit cards and my ID so I added two 3 inch square pockets to the pieces that I needed. It might help if you make a template on a sheet of paper and tape the pieces together to better visualize the end product. The circuit sheets are very forgiving and tape can be pulled off without damaging them (in my trials).



Use thick packing tape for this project for the best durability. I have been using my wallet daily from October through March and have only needed to add one small piece of tape. Where the wallet will fold leave a few millimeters between the circuit sheets for a hinge. The more space the more cash (or receipts) the wallet can carry without being forced open by the thick bills.



You might find it helpful to cut pieces of paper out to make a crude template to see how you want to configure your pockets. Just remember to try and build the wallet so that the tape is folded over any seams. Tearing the packing tape is much more difficult if it is folded onto itself.