I riveted the aft deck. I have spent alot of time trying to figure out the seqeunce for the installation of the F-721B side rails and F-757 gussets. The F-705 bulkhead has several conflicting rivets. I checked the forums, but found more questions than answers. Anyway I moved ahead to the F-695 gussets, shoulder harness anchors and F-656 gussets. I fitted the aft top skin which was difficult at first but after fluting the bulkheads it went right on.