Never tried it, but how about a Fein Multimaster with a cranked saw blade?

Evan Gatehouse wrote:
I am going to trim some plywood frames that intersect the hull right
at the shoulder position of a few quarterberths. These are either
1/4" or 3/8" plywood frames, tabbed both sides to the hull. By the
way, I'm a naval architect and mech. engineer so I have a pretty good