I just got finished with installing the Trutrak roll servo bracket yesterday. My installation looks just like James'. Acording to the Trutrak diagram, the bracket is supposed to be far enough aft so that it shares one of the rivets already in the floor rib. As James and myself found out, there is a stiffening bead in the floor rib that interferes with the bracket if you put it there. When I moved it forward enough to clear the bead, I had a little interference between the servo arm and one of the floor stiffeners. I ended up bending the stiffener a little bit in that area and problem solved. If you haven't done the floors yet, you should be able to rotate the stiffener 180 degrees and I think it will clear the arm.
The other minor gripe about the installation was the pitch servo brackets. I had already installed the brackets that I fabricated per Van's plans. I had to drill out the rivets and back drill through the holes in the baggage ribs. Not a huge undertaking, but it would have been a lot easier and cleaner if I had installed the servos much earlier in construction. Live and learn.