Joel,
A couple of questions:
Would one use a bit of cabosil to thicken the epoxy in a scarf joint or only un-thickened?
Also, I have seen / heard of a couple "jigs" sold as a tool for scarfing. One utilizes a power planer and another that uses a belt sander. Have you experimented with any of these scarfing jigs?
From your pictures and description, you use the power planer and grinder "freehand". You are obviously skilled at this process. Any tips for shortening the learning curve?
Has anyone else out there experienced a scarf jig?
-Kruez-