Did the Big Flip! It actually went pretty easy considering how much I worried about it. It sat on the bottom facet just fine while I scootched it over to make room for the 2nd half of the flip. I am building in a single car garage so it is a somewhat tight fit. I did it solo.
Rounded over the butt block, trimmed the shell edges using a laminate trim bit in the router, which went well though it covered me in sawdust! Lots of shop vac cleanup after. Applied the butt block fillet after a bunch of sanding just to clean up the floor board underside.
Glassing the bottom tomorrow. Pix tomorrow of that.