I will install the rub rails this week or next, so thought I'd post ahead of time in case anybody wants to offer some suggestions. This is one area where the manual and blogs don't go into much detail. Maybe it will be easier than I'm anticipating? I'll upload my pictures when I'm done.
So far, I've ripped the wood into strips of the appropriate size with a 103 degree bevel on on side, per the plans. There's no way I can glue these scarf joints together ahead of time and get them straight, so I'll scarf on the boat. My plan is to use one screw to attach an 8-foot strip in about the middle of the boat, with scarf tapers cut at both ends. Then, using that as the swivel point, work my way down towards the bow, screwing it into the boat every foot or so, making sure the curve looks good. Next, take another strip and start from the end of the first piece until I reach the bow. Repeat for the stern.