So I opened one of these up today to install a 3d printed part (that didn't go well, see below).
I've taken some better pics of one board (I don't have the other yet) because I'll no doubt need them anyway. Apologies for the rotation etc. Couldn't work that out in Imgur.
As for the printed part. This evidences how much of a dufus I am: I printed a tacti-cool rail attachment from thingiverse. Only to find it replaces the translucent light cover for the team/hit etc LEDs. What colour did I print it in? Black, of course!
Lesson learned: don't mess with toys you haven't seen in the flesh yet!