What do you guys think about this DIY Dolly.
 

ikea hacker: Ivar loves Dolly

I think I might try it for myself this weekend Ill post pics and a video if and when I do.

I don't think I've see a square-tracked dolly before. Interesting. There are also plans on the Digital juice website, from which I built mine described here:

Be A Maker Robert Kerner’s Blog

As I mentioned in another one of your posts, the dolly works. It is certainly not elegant but it helped me understand what I really need in terms of camera movement.

Bob