Imagine a freshly cut-out plywood bulhead lying horizontaly on a table
before you. The bulkhead will be attached to, or installed into the
fiberglass hull using 'bonding angles' i.e., several layers of 'glass
/ epoxy that will lap onto both the bulkhead and hull. I'd like to
relieve, or remove, about 1/8" of the plywood (face) material all
along the edge of the bulkhead (where it will bond to the hull) for
(say) 3" from the edge on both sides of the bulkhead. In this way,
the 'glass angles will lie flush with the bulhead surface.

How do I do this? That is, wat tool(s) would be used for removing the
plywood, leaving a clean cut of consistent depth?

Appreciate any tips.

Mike Worrall
Los Angeles