I'm confused - you started this thread talking about 501X/511's and now you're talking about a 2WD? My comments about the batterys was for the 4WD 511 only... YMMV with other cars.
Just for clarity:
You do not need to modify the 511 chassis/bulkheads to fit the IP hard case saddle LiPo's.
Fredriks cradles are carbon fibre, and do not affect roll centre or centre of gravity by themselves. They do however move the battery back a little which has a positive effect on pitch and yaw (in my brief experience).
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