I know nothing about router blades. Ignoring the possibility of a router
blade, you can get a consitent depth of recess by first scoring the area
to be recessed with a saw set to the depth of recess you want. Perhaps run
a hand held circular saw along a line parallel to the edge of the bulkhead
and then run a few cuts between this first cut and th edge. If the depth
to be removed is only 1/8" there will be no problem following a curved
line with a hand held circular saw set at that depth. Then take a power
sander and sand down until the saw cuts just disappear.

If working with plywood its pretty easy just to sand off the face ply. Its
obvious when you start sanding into the second ply. If the face ply is the
depth you want to remove, you're laughing my son.

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