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Yes, I removed IC5 and IC6 from the board, as they are no longer needed with my FET upgrade. I removed the aluminium heatsink from the bottom of the chassis as well.
Functionally, the circuit has continued to work well. Even the hottest motor I have tried hasn't gotten the FETs hot enough to burn my fingers.
The only problems I'm having right now is the durability of the connections to the main board. I've ripped traces offthe board twice now, though it wasn't all that bad and was easily repaired. Obviously there needs to be some sort of strain relief on the wires. Also, I'll probably find that when I go to the Plasma Dash motor, I'll need to upgrade a couple of the wires, as the CAT5 probably won't handle 4A of current.
I'll probably be revising the layout one more time, possibly putting everything in a line. The reason for that is I can't fit six cells in the car with the FET board right now, there just isn't room. Even in the MINI Cooper body.
I also want to be able to fit the power capacitor in there as well. That may be changed to a group of smaller caps in parallel, because the 10000μF cap I am using now is too bulky to fit in the places where I have extra space.
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-- It is by will alone I set my mind in motion...
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