Darth Editous said:

You can be a few pixels out with a mask on a still and it will go unnoticed, but if that mask shifts by another few pixels on the next frame, even if it still looks great by itself, the motion-detection bit of your brain will light up like a Christmas tree. It's a constant back-and-forth - adjust frame 2 to match frame 1, then you'll need to adjust frame 3 to match frame 4, only to find you can't maintain that into frame 4, so you have to go back through the frames again...

It's one thing do a nice mock like Angel seems to spend most of his waking life doing

True.. the maskin work is pain.. Ady said that even the simpler shots need over 3 days of work.. (thiniking back what her did in the smoke hoth shot)

No David, you havent seen yet what i can do in my sleep ;D :D

Here is a hit..

Now i see that the curvature of the upside down gives a more advanced look rather have straight lines.. now ofc you are right that it needs more work to make it more correct but it worked well. Curves vs straight lines always win :D

-Angel