1) The first thing I did was to cut my retroreflective sheet to approximately the right size. Again, you can use the pattern on zieak's instructable
, but I mostly made mine up as I went along. Mine uses fewer pieces for an unbroken spine, which I think is more durable.
The overall size of this first rectangle is just a bit bigger than a dollar bill. I gave it maybe a quarter inch on each side. This was the basic pattern for the wallet; everything else just extended from there.
2) I stuck this rectangle of retroreflective sheet to a nice-looking spot on the keyboard sheet, carefully laying it down and pushing out air bubbles. If you're patient, you can use a bit of water for a completely bubble-free seal, but then you'd have to wait for everything to dry, and I was not so patient.
3) Next, I cut the keyboard sheet precisely around the retroreflective sheet to make a single rectangle. I cut out another keyboard sheet rectangle using the first as a pattern, making two, one with the retroreflective sheet and one without.
4) Finally, I stuck both down on a laminating sheet, as you see in the photo below. All the same care is required here to avoid bubbles. The photo below is take from the non-sticky side of the laminating sheet. This is the eventual outside of the wallet, so you can place things as you wish to get the outside to look the way you want (I decided to have my retroreflective sheet with the silver side out. The next photo is taken from the sticky side of the laminating sheet. You can see the black side of the retroreflective sheet, here.