Pulled the aft fuse together and completed the bay. This entailed fitting two horiz tubes at the aft end of the bay, and one diagonal that goes from the UPR LH corner of the bay to the LWR RH corner. I screwed up the first one and it came out too short by not quite a quarter inch. I've learned the hard way that this is just to large a gap to fill with weld. All these tubes are tacked in now. The fuse has taken on an amazing stiffness after the addition of just a few key members. This is nice because I can lean over and on structure now for support when working on things.
