[Nuttyman54]

1/8" is a pretty standard drop, and should drive just fine. I also echo the recommendation to us C channel where you can to save weight. The front and the back rails are especially good candidates for that, and you could also use them on the inner driveline rails if you do it right.

If you have the capability, direct drive to one of the wheel pairs (typically the center pair) is a great option. I don't know if you can do that with the KOP gearboxes, but one less chain means less weight, and also ensures that you can still drive, even if you throw all your chains.