Those handles are a staple item for when I need a few handles for something. I cut a gazillion of the "feet" and just keep them in a box until needed. I also made a few templates for gluing them up and drilling the holes. You can see it in the lower right corner of the v1.1 picture next to the tape measure.
I only have a few tapes, but I tend to hoard players. I have one of the early Panasonic 6300's built like a tank, you even had to manually adjust the tracking 🙂