Don't ask me why I trimmed the card board so much. If I am unhappy about one thing with this project it would have to be this decision. Either way, after trimming the inlay, I carefully applied contact cement to the piece. I also applied contact cement to the interior of the bag flap around the ribbon cut out. I waited for the cement to set in and become tacky before I carefully attach the inlay.
Once the inlay was attached, I carefully and with a bit of force use my thumb to press around the ribbon to make sure that the cement makes contact with both pieces.
Here are both of the flaps completed after the inlays are attached. The next step is to scribe the stitch lines around the ribbons for stitching.