This has always been one of my favorite mech designs. If hot toys made one, I would pre-order it in a second.
I have the tiny one they produced last year, and it is WAY to small. I disliked about the whole concept of a lack of a vocal unit. It had great sound effects during the movie. Why the designer went with flipoutLCD face is something I'll never figure out.
I somewhat agree with Jenius about the lower body thing, but I think the extra armor would have slowed it down and added a more human aspect to the character. I think they were trying to empathize the differences between man and machine with the design somewhat.
There was a kit model produced. Here are all the pics I have.
cain.bmp
cain2.bmp