I can so far create something like the following. Added multiple avatars, and camera transitions.

~ * ~ * ~ * ~

The UI for the studio is improving step by step, and right now it looks like this. The separate javascript studio:

And what you'd call a mixer that puts all the videos, audio and illustrations together:

Currently I spend a lot of time on matching speech and movements by the millisecond, so the timeline plays an important role here. The timeline runs from the top down, rather than from left to right.

Stay tuned for updates.