Tonight I didn't spend a big day in the garage. I took a good look at the fitment of the F-902 bulkhead with the F-717 longeron. The bulkheads seem to want to lift the F-717 just a bit so they do not sill parallel with the angle of the bottom skin. Both the bottom mounting tab and the flange impede the F-717 sitting where it should. So some very slight and careful adjusting of the bottom flanges are necessary.
Looking much better....The F-717 sits parallel to the bottom skin.