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Not sure if you mean all of it, or just the carving part, but I used a 1" hole saw on a drill press in the small opening, and a 3" hole saw for the two larger rounds. Then spindle sand the edges. Then use a jig saw and chisel to clean up the small opening. Next is a router with a cove bit with a bearing. Then using a carving knife and carving gouge to get the shape. Hope that helps!
Make Your Own Gear, a term for people that sew their own clothes, backpacks, tents that are usually ultralight and cheaper than buying commercial