Started this morning with back-riveting the forward fuselage ribs onto the bottom skin. Had a little help from Everett with setting rivets and taping them in place. Was able to back rivet all except the short "-D" ribs which are C channel shaped and needed to buck. Temporarily clecod the firewall and tunnel ribs in place to support the assembly and my wife helped me get the 6 or so rivets on each side. Back-riveted the seat support bulkhead pieces to the skin with the exception of a few that had to buck, but was able to get those myself. Back-riveted the systems support brackets in place.
Time to join the firewall permanently to the front skin. I used 3M Firestop caulk along the bottom flange of the firewall to skin and also used it to fill the gaps in the corner of the firewall recess.
4/16: big day today. Wife helped me rivet the tunnel ribs to the bottom skin then I finished a few of the rib tab rivets myself. Time to join the fuse halves together. I got the front propped up on a crate about the height of the rear, which was on the cradle. Then pulled them together and installed the spacers with some hardware store bolts. All lined up pretty well.
Cleaned up the shop and then permanently installed the heater controls boxes in the firewall.