Step 1: Acquire the objects to integrate.
Dark colored felt surfaces guards
Aluminum card case
Miniature ball point pen
3M double stick foam tape 1inch
Gaffers tape 2inch
The card holder is from Muji (www.muji.net), this can be purchased from their English site categorized under Shopping > Stationery > Desk Accessories card holders
The pen is a Retro 1951 brand passport model, no online sale has been found for this particular model. Use any small checkbook pen with a cylindrical shape, just plan ahead for the sheaths placement on the book cover. Here's a tube made from the gaffers tape, this will be a test piece to see if the pen will fit snug. What ever pen is chosen for this mod will become the only pen type to fit.