I agree with a grinder (grindette, 4") being handy (I have four, to save changing from cutting to grinding to sanding etc) and you could sub one for a jigsaw as it has more uses, but, it will not cut fair curves very well, so for trimming GRP I prefer a jigsaw with a metal cutting blade.
Flap wheels in drills are simply horrid, sooo diy ;-) There you are much better off with a sanding disc in a grindette. Sculpt away!
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