Kodos, you have a lot of good ideas but how are you going to impliment them? Start trying to work some of this out before you drown in your own enthusiasm.
Start with the basics then work your way up. You seem to be getting too far ahead of yourself. You're worried about cutscenes and already have 200+ megs of extras?
Worry about the mod first and then the rest of the fancy fluff.
Don't take this as a harsh criticism or anything, I just don't want to see you give up on a project cause you realized that half of what you want to do won't be possible till SE XII.
For now just start figuring out which ideas can be done in the game, which ones can be faked, and which ones have to be scrapped till they change the hardcode. Just try to make a mod that you enjoy instead of trying to straight-off compose a masterpiece whose beauty will bring tears to the eyes of our grandchildren and forever after be held aloft as the pinacle of modding achievement.
The opus can be made in stages, you don't have to do it all at once.