FreeCAD screenshot of the jig. There are two halves, hinged in the middle. The “top” is on the left, C-shaped cutout where the screen goes, with various pockets, and holes in the corners. The “bottom” is on the right, more bare frame in construction, with matching holes, alignment pegs that match holes in the top, and an extra panel on the right that holds a rectangular display in place on three sides.
https://assets.chaos.social/media_attachments/files/113/215/233/537/208/977/original/8d9650df06be129f.png