Hi Turbine D,
Thanks for your post,some additional infos from my side.
" Each wing has 62 ribs, 38 are metallic and 24 are carbon composite."
Your amount is correct but officially they are talking about 23 CFRP and 49 in total.The difference comes from a center spar from rib 2 to 17.So these ribs
are half ribs but counted as one.Ref video at 7.12.
" The rib feet on the bottom of the structure that you cannot see..."
This is the opposite way.The installation of the panels in the video is showing
the bottom surface.You can identify the bottom by the man holes.