Stunning and jaw dropping. Nice work!
Very cool.
Heh, I nearly asked what kind of CNC mill you used after modeling 
good job, really.Great 2B motivated by so many good artists. thnx+
The matchmove looks awesome! The concept and delivery are very good. Hats off for creativity.
I do have one critique, though, which bounces off an earlier comment about ambient occlusion. You may want to consider the shadow that the castle would cast on the wall behind the workbench in real life. I think one thing that kept the castle looking a slight bit CG was the fact that the viewer never saw a shadow grow up on the wall. Furthermore, as the castle grows larger, the shadow on the workbench-wall would get bigger… this would make the AO shadow on rear of the castle itself get darker until the castle/shadow stops growing.
I’m not expert, but I’ve found from playing around with cycles that shadows can make all the difference. Human eyes are better at picking up subtle clues than we give them credit for.
Anyway, all the best!