Fun little WIP, please critique

[Mazin]

I got bored, so I decided to try my long-time idea of animating a (completely fictitious) assembly line.

I have parts 1 and 2 mostly done. Pt 3 is the longest, and it's partway there. I want a couple people to look and see if there are any obvious mistakes, as well as how it could look better. I know the tan box thingy looks horrible, and I'm gonna add a couple particle things in it. I don't know about sound - I'll either have to add in in Video Post or Premiere or equivalent video compositor.

http://www.youtube.com/watch?v=Y_YQ6yxVpiM

(I woulda google videoed it, but google uploading didn't work for me)

I tried to keep the render time low, given that I have 1 comp that's not particularly fast, and that the whole thing will be around 1800 when I'm done. Render time shown is about 16-17 sec. No raytracing.

Part 2 is also there. It's mostly done, compared with the rest.
http://www.youtube.com/watch?v=UG0azJiM1fI