With the rear center seat belt attach fitting installed, I turned my attention to placement of the other floor channels. Keeping in mind the potential need for aircraft track behind the front seats, I decided to add two extra channels centered directly behind the front seats to help counter the potential abuses a rear passenger might impart on on the floor while climbing in and out of the plane (image 1). After that, I left everything else about the same as described in the manual and began adding all the clips that tie the bulkheads to the channels (image 2). Once that phase was complete, I removed everything for deburring and priming. Then, everything was riveted in place to get ready for the top floor skin (image 3).