CubeSat Standard Read-Through: Mechanical Specifications (Part 1 of 2) 

I think the Figure 5 at the end of the video is correct because it shows the +Z vector as a circle with an "x", which is the usual way to indicate a vector entering the displayed surface. If the +Z vector is entering the displayed surface it means that the displayed surface is the -Z surface, I believe.

Hello you read my mail?