[Big Kev-O]

If I understand correct this method would not require the cab to be removed, as stated in the brothers instructions. Also I assume the reason you drilled out the cab mounts was to bolt in the C-channel as the brother kit does.

Does this drawing represent your measurements and cuts?

Thanks for the right up, I really didn't want to pay the $ for the brothers kit and was about to get a c-channel from a fab shop. Your solution seams ideal.