Another Caveat here also. I build all my guitars using hand tools only, so my experience will be different than most of the folk here.
Ash is fairly easy to work with and a coping saw will definitely get the shape you want but it will be rather slow and tedious because of the small teeth. I agree with Jim in that I would use an ordinary saw, in my case a hand saw, and take off the big chunks that get you close to the shape/size you want and then use a rasp to get the final shape, then sand, sand, sand. I also agree with Jim about the Japanese Saw Rasp. I bought one several builds ago and it is by far the best tool I own, and highly recommended. Removes the wood very quickly without the ripping and tearing that you sometimes get with a course rasp.
It looks as though you have some sort of template there, so I would pencil around that and work back to that with saw, rasp, files and sandpaper.
I have also shaped several scratch plates and use a coping saw for that. Easy peazy.
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