I got a little time in the shop today and made some more progress on the seats. I drilled the holes for the seat back pivot points, then welded in the bushings. I really want these to line up, otherwise the seat backs won't pivot without binding. I used a piece of 1/4in all-thread to hold the bushings in place and tacked them. Once tacked, I welded them to the frame. After that, I ran a 1/4in rod through to confirm the alignment and they are right on! On to the reinforcements.