I have removed about 2mm from under the bulkhead for my lipo's... they are demon power 5K's... had to do a bit of work on the bulkhead cross piece as well... the car's handling has not suffered as the stiffness of the bulkheads and chassis has not been comprimised... go ahead, get grinding... you'll be fine... and believe me, the chassis will be more than capable of handling the extra power...
