I completed the return roller stowage brackets on each side and have the rollers bolted in place on their brackets.
Also finally dealt with the A frame boom retainer pins. They have a folding tab at the end that drops down when they are inserted to retain them, as well as a bar under the square head of the pin to stop from vibration rotation. I soldered the bar on after I took the photos so it’s noticeably not here but it’s done.