For final fitting of the chair shell to the back stretcher, I spent some time sanding-down the rough fiberglass in that area.  Eventually, the entire underside of the shell will be sanded smooth and (probably) painted.

After a little more sanding.

The original pad on my old Rotex finally gave out during this sanding.  I can't remember exactly when I bought it - probably 15-20 years back.  It's been a workhorse, so that pad has definitely put in its time.

With all the mortises cut and pieces fitting together nicely, I could finally spend some time rounding those hard edges.  I'll be doing most of the rounding at the router table, but first I roughly rounded the ends with a rasp.  This will help prevent kickback when starting a cut with the router.

The leg assemblies are just under 1" thick, so I started with a 7/16" radius bit that got me to this stage.  I spent a little time with a card scraper easing the transition from edge to face.

At this point I decided that I wanted more curvature to the edges to reduce the size of the flat areas on the legs.   I went back over the edges with a thumbnail bit that would reach a little further onto the faces.

It's probably hard to see much difference from the photos, but this did help make the cross section more lens shaped.  This still left a flat section where the back stretcher joins the leg.

I'm happy with how the legs are looking.  After a bit more scraping and final hand-sanding, these parts will be done.