Thanks for the help! I should've' checked the latest walkthrough earlier instead of the older one.
I've done a lot of the new quests now after downloading the latest version.
As for the gallery scenes, I got some of them, but some still remained hidden for whatever reason. I figured it out in the new version, so perhaps an error on my end.
For the shells, I am confident the error was produced, atleast in my case. For a very long time, I created shells without actually introducing them to Nimhe. I would wonder why they couldn't be seen when i selected them. You're right, they never produced a reaction, but later on in the day, Nimhe would produce the shell. Her TEC was maxed out at 40 by the way. Everything was present except for me unlocking the shell. The only cost would be the cost of the shell (3 precursor, mil, or advanced, etc.). I'll try to find an older save and see if I can reproduce it.
Dax studio sounds amazing! Very high quality!