Those thing will eat a toerail in seconds - don't do it. I had one of the Makitas 'cause it seemed like a cool tool - it was the most useless power tool I ever owned. There must be a reason it was invented but I never found out what it was.
Face facts - the job you describe is a hand job (pun intended) - there is no power tool appropriate to it I'm afraid.
There's a guy I work with who has one of the Makita tools there. He uses it for shaping holes etc after he cuts through a hull. Great tool for the right job.
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