Owen Racing - No offence, but I have an Mi4LP chassis sat on my desk as i type this! So I have a good idea what it actually looks like it. The Chassis is narrower, and the LiPo is moved out. For those LiPo's that have the regulation humps in the bottom, there are holes in the chassis that capture those, and locate the battery. For those that don't have humps, some Carbon locators to fix to the battery. There is also the carbon plate that goes around the outside of the battery - this should give the battery quite a bit of protection I would think. I have been running without this, with no real problems, so adding this should just improve it further.
The overall effect of all of this, is a balanced car with no extra weight added, and nothing else moved (except that battery as we've just said).