I’m in the process of attempting to rebuild a 1943 eleven foot Old Town Trapper. The inwales and most of the ribs must be replaced. The few ribs that were more or less in tact all needed new tips scarfed on. The first few I did were done with a Japanese pull saw. It was a challenge to stay away from adjoining ribs while sawing. That was when I started thinking about a multitool. I went on line and ordered a Porter Cable multitool. It made this job very easy. This tool allows you to plunge cut both the rib and the replacement at the same time. It also allows you to make a fairly steep scarf join thereby increasing the glue area. By clamping the replacement tip to the old rib, you can make both cuts at the same time thereby guaranteeing that the angles will be the same. As a bonus, the tool also works great to taper the ends of the last four ribs adjacent to the stem . Attached are a few photos of the process.