Above is a pic of how ive done mine.
This is a home made job so its not the neatest as its only been done for some testing.
Ive found with the electrics centered down the middle the car is more responsive, changes direction quicker without rolling as much, and has more steering as there is more weight towards the front. The car in general just feels more balanced.
When the traction is low and your struggling for rear end grip all you need do is bolt around 30-50gof weight to the rear of the shock tower and/or put some weight under the rear lipo. Also giving therear camber link loads of angle seems to help keep the rear locked in on low traction tracks, especially in the wet.
Fabs has sent me some drawings of the parts he would make to give this lipo configuration and i for one must say it looks very professional.
He has also sent some pics of the brass weight you can bolt to the rear of the shock tower and the brass strip to go under your lipo, both of which look sweet!