crt.5 how to hold a 6000mah in there?

Hi, i just finished my conversion and i want to use a 6000mah 7.4 maxamp, i guess i will have to place it on it's side if i don't want the batt to hot the spur or being too far outside the chassis. So my question is, how do you hold the batterie there? the stock battery mount from the rc-monster kit is not tall and long enough, the bracket is too short, and the poles not long enough and how do you make sure it will not move and hit the spur gear?
after that, it's ready to hit the dirt!!!
i just glued a new set of dirt hawg II for bashing!!

Oh, very last question, the stock body is not long enough since i had the 1st version of the crt.5 with the short chassis, what kind of body should i used?
Thanks a lot!