There's a single screw that holds the Filco Tenkeyless boards together, it should be behind a do-not-remove sticker. After that, there are six clips, 3 along the bottom and 3 along the top. If you look closely on the lower shell, you can see small marks for where the clips are. I used a guitar pick to open mine up, so I wouldn't scratch the plastic. As for painting plastic, I've had fairly good luck with the Krylon Fusion paints, which are the ones designed for plastics. There's no sanding needed, and I've found them to work better without sanding, unlike typical paint.