Need some help with possision of the ball.

[GX67]

We've been having some problems deciphering the rules that apply to the holding of a ball, and the bumper zone.

This is a link to our current chassis: Click here.

The 12"x12" (tentative) zone to the right of the image is the place where we're thinking of herding the ball, and having two 6" diam. wheels from Overdrive as the rollers for the ball. They'll be put at an angle, each perpendicular to the other, to brush the ball and allow for the ability of herding a ball and then shooting it out.

The trouble is, we're not sure of what is defined as the "Bumper Zone" in our case, and therefore have no idea as to whether or not we are allowed to have the wheels in position in the first place.

So the question is this: Would we be allowed to have anything like a roller to brush/roll the ball around, and if so, what would be the allowed height?

Any help with that question would be greatly appreciated.

*Note: The two wheels will be at ~45 degrees, and the axle will be about 10" off the ground. The wheels will be pushing down on the ball slightly from above.