Since RD doesn't ever seem to want to be bothered with measurements, numbers, and facts, I figured I might as well measure the C4 rear dimensions myself.If I had some dimensions, I'd do a drawing and settle it.
The stock halfshafts are 18.125" long and the lower strut rods are 18.375" long. The distance between the two inner u-joints is 14.75" and the distance between the two inner strut rod pivots is 13.188". That makes the strut rod pivot .781" inboard of the u-joint center. The vertical distance between the strut rod inner pivot and the center of the inner u-joint is 5" (this was a LATE suspension). The vertical distance between the strut rod outer pivot and the center of the outer u-joint is 6".
All dimensions for an early suspension are the same except for the vertical height of the strut rod inner pivot.
The distance between the inner toe adjuster rod pivots is 3" (as close as I can tell) and the rods are 21" long. The inboard pivots are vertically 6.5" above the inboard strut rod pivots. I'd just assume the rods are parallel to the halfshafts, which is close. I think you have the location of the dropped toe rod inner pivots.
My rear suspension is narrowed 1.5" per side, so halfshafts are 16.625" long.
That should give you enough info to lay it out and see how camber changes from a static -.5 degrees from -3 to +3" suspension travel. The toe rods don't do anything to camber but I put the measurements here for further analysis.