Apparently, the little sketch with a couple of measurements is the only 'plan' for the F5 bulkheads. After building the much more complicated forward bulkheads, I am pleasantly surprised to find that this doesn't bother me. Knocked out a couple of builkheads with matching cut-outs for the mid-fuselage stringers in a couple of hours. A quick hit with Zinc epoxy, and I can let them set up for a couple of days. Tomorrow I'm going to be up in the air, and I don't expect to be building much after that.