Here's my first look at it... overall it is 127.9 by 74.4 mm. The sides rise up 2.2 mm and then go up 1.7 mm and in 1.7 mm, forming 45-degree facets along the sides. so the door is mostly 3.9 mm thick.
Those side facets meet up with one along the top. It's at a shallower angle though, because it goes in 3.6 mm instead. Once that facet drops 1.7 mm and makes the top edge of the door, it only goes 0.8 mm.
So, now you have gone 0.8mm back into the box from the top edge of the door, that 0.8mm surface is a little ridge. It turns 90 degrees downward for 0.8mm as well, before taking another 90, this time towards the back of the box, by 6.5 mm. This is a 1.4 mm thick flap that has two rectangular holes in it for locating tabs in the main door frame.