You can see the 4 spots on each part where a small circular magnet can be placed. I used diameter = 4mm on the small box and d = 5mm on the bigger box. These hold the lid on nice and tight.
The small box is sized to fit classic gameboy games (and GBA since they're smaller). The bigger box will fit a Gameboy SP with charger and games with room to spare. I wouldn't use this for lots of travel unless you plan on padding it out with something.
Looks great with Gold or Yellow plastic.
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Make it last
Acrylic paint works well. Sanding the areas down first can help the paint stay on. Use a glossy finish to keep it from wearing off.