Grid-pattern organizer for the lid space in Pelican's 1560 case.
I recommend either plywood or acrylic as your material for this piece. 3/16" (0.187) or close to it to maximize the space inside the case.
I used acrylic to make the one pictured.
Uses 1/2 inch velcro cable ties. A list of mounting hardware is included on the installation instruction sheet.