Hinged Box Enclosure with Pocket Grid

Create a rectangular box enclosure, 220 mm long, 140 mm wide, 55 mm tall, with 2 mm wall thickness and 3 mm rounded edges. On top, in the front half (115 mm of the 220 mm length), cut a grid of rectangular pockets arranged in exactly 4 columns along the 115 mm length direction and exactly 7 rows along the 140 mm width direction, for a total of exactly 28 pockets — not more, not fewer. Space the columns 28.75 mm apart center to center, and space the rows 20 mm apart center to center. Each pocket is about 26 mm long by 18 mm wide and 12 mm deep, with a small gap between neighboring pockets. In the rear half (105 mm of the length), leave an open compartment for electronics. Add a flat lid on top, 3 mm thick, hinged along one long edge, with a rectangular window cutout in the middle, about 180 mm by 100 mm.

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