Paul, I take the definition of a monocoque as being the bodyshell also serves as the chassis, not too sure what yours is.

I also dont particuarly see how four LEMs, Hardox and a full pressure Nitrogen flipper can ever be in weight, especially since youve now increased the wheels. Four motors driving six wheels equals lots of chains to make sure all six recieve the power, which increases the weight...I dont honestly see the need for four motors here anyway.
Like Ive kept saying, it will be closer to being in weight if you lose two motors and use chains to transmit the power (this is actually better than having four for a coule of reasons, which I wont go into here)