Here's the final version. I cut the top down to just over the height of the motor because it was hitting the top chassis rail on the motor side.
I also had to make a notch on the bottom to make room for the servo arm. Its a lot bigger than it needs to be, but I may install a longer servo arm one day.
The DB17 chassis does require some cutting to make room for the larger motor.
I'm waiting on some pinion gears from TCS and also trying to fab up a rear spoiler mount so the truck won't be all back together until this weekend at the soonest.
The mount does work great though.