Today after getting home from Dayton, I clecoed on the F-704 bulkhead and match drilled the new F-776 center bottom skin to the forward holes in F-704. I didn't get any photos, but used my 12 inch #40 bit for that.

After that, I removed the four F-786 J channel stiffeners, cut them to length, and notched the ends to fit the F-706 bulkhead.