It's been a while since I last made any animation with SketchUp. I used the spiral staircase model I made, which I also shared on that page, throw in a few sections and scenes and here's the result:
This is not a real construction or assembly sequence by all means, I made this to brush up my rusty "section-planing" skill.
Like usual, the scenes are exported as 4000x2250pix PNGs and assembled in VirtualDub and encoded using x264 codec. VirtualDub can be found here, and x264vfw here.