As long as most of the weight is on the outer rim, then it should work fine.

But I still think you should mount the disc on the back. As your scoop still will be your main weapon, the disc will stall then every time you push your opponent.

So it will never actually reach the kind of speed youre hoping for, unless you mount the disc on the back!

Im not complaining on your design, these are just suggestions. If you manage to get that kind of energy, then it would be sad if you didnt use it properly!