I was making one of these for myself and I made a cutting template for the inside so I thought I'd share. The outer rectangular block, once cut, will fit into the Universal Game Case's internal cartridge holder tabs. Once placed, cut out the shaded areas for the Rumble Paks themselves. Hopefully this will help a few who want one of these for themselves. http://www.thecoverproject.net/uploads/raw/DoubleDownOn11.custom.raw_n64_n64rumblepakcut-outtemplate.jpg