I started by fabricating a new right forward skin stiffener from 6061-T6 angle stock. I then fabricated and drilled spacers and an angle clips for attaching the forward ends of both stiffeners to the F-704 bulkhead uprights (photo 1).
I then carefully measured and drilled the forward stiffeners for attaching the rudder pedal bearing blocks. I used 0.063 angles to position the blocks to ensure they would be flush with the outboard face of the stiffeners to which they will be attached (photo 2). A trial fit looks good (photo 3).
Now for the one step back. :O( I misinterpreted the detail for splitting the F-6115 center bearing block as a different view of the F-6116 outboard bearing blocks, and proceeded to saw them in two. This made sense at the time, as I thought it might be necessary to split the outboard bearings to install and remove the pedals after the stiffeners are permanently installed. Not so...
Angle clip and spacer attaching the forward skin stiffener at the aft end.
Setup to ensure bearing blocks are flush to the forward skin stiffeners.
Test fit of rudder pedals and bearing blocks look good.