Okay, so then we can take this seriously.
I would recommend learning a few of the building fundamentals around here. The basic ones and easiest to start with is shaping your chassis to the components you plan to put inside it - so that there isn't any extra space inside which ends up being wasted weight. Additionally, try to use all the available weight in a useful way (with more drive, exterior armor or weapons).
Once you've done that we can probably move along a step and get to more stuff to help you really get going.