Acyrier,
If the batteries were nested all around by the chassis it may work.... It's hard to see in the pics posted, but the batteries on the BMI chassis sit in a milled slot which makes 3 point contact (side, bottom, and side). We left material under the battery (.02" thick) to keep the chassis as solid as possible for carpet racing. Then added a small channel (.01"dp.) on the bottom for the battery tape to sit flush with the bottom of the chassis (no dragging).
-Wayne