[James Juncker]

Hmm with the weight of those wheels you are going to nee to fool the scale somehow, I personally think you should install some Rotary Propellers to create lift for your robot. this would allow for your robot to not only come in under weight but also keep your weight and CoG in the middle of your robot at all times. I also think that you might want to look at the dimensions of your robot being 50x20 as it is over the perimeter limit on our robots.

If you were to install some 8 wheel pneumatic system with a gap in the center and dropping your chains down and then having a utility arm for dealing with obstacles and boulders I feel you woul find it more worth your time, also the layout for mechanum wheels should be like this for he rollers

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where the rollers all point towards the center of the robot. you may want to also make your connections water tight if you are planning on crossing the moat this year, I hear they are planning on filling it with dehydrated water for the competitions.