Greg,
I was just taking a look at the rib tracing to check for symmetry. I worked on the root rib and found it to be a tad off - probably die cutting.
In any case, I drew up the first root rib in CAD (its now 100% symmetrical). If I didn't have an impinged right shoulder (yeah... royal rotator cuff pain - literally), I might find inspiration to loft up the full set.
Maybe one a night...

Actually some days are better than others.
David.