I'm making a project that uses these 8x8 RGB LED matricies and I needed a reference model. I couldn't find one so I knocked this one up in OpenScad. Seeing as I couldn't find one here, I figured I'd upload it so anyone can use it as a reference in the future!
There are two versions: both with and without header pins in the board (note though that the without doesn't have any holes where the pins go through) as well as an openScad file that generates it.
All measurements taken using my calipers, and each board has quite a few variances between LEDs, let alone boards, so be wary of that when using.