Here are two most aft bulkheads (F-811, and 812).

The horizontal stabilizer rear spar attaches to the two bars that stick out of the top of the F-811 bulkhead.

I've got to prime and rivet the firewall (F-801 bulkhead), and finish the wing spar carry through (F-802 bulkhead), then I need to get a fuselage jig, which means I have to convert the garage into a workshop, because the fuselage is too big to get out of my basement if I built it there.