I havn't crunched the numbers.. but wouldn't it have just been easier to get an adapter and go dual t-cases?
I understand your reasoning with having more gear selection but geez, with Duals you've got 15 forward gear. That seemed like more then enough for me... I definently give your prop's for doing something off the wall!
Did you build your own D-shafts or have them built? I bet custom D-shafts wouldn't be very cheap! lol
Can I see pic's of In-Cab to see where your shifters are located?