A simple panel with the infill showing. Size 100x100 mm (approx 4x4 inches).

It is a bit big so you may want to scale it to 90%. Don't get too small or the holes will be too small to secure the corners.

This thing was made with Tinkercad.

Printed with no top or bottom layer to show the infill. In this case I used archimedeanchords in Slic3r. I got the idea from a similar project using old floppy disks I saw on CNET.

Use zip-ties to secure the corners. Work from the bottom up.

I may do a fake floppy disk version if requested.