Hand power planer....ever watch a good surfboard shaper or yacht builder use one...in a for profit environment block planes are too slow except for very minor tweaks.

I have even seen jigs set up where the hand planer rides on rails following a predetermined arc, kind of a poor man’s answer to CNC. If you do some research surfboard shaping you will probably find some pictures.

Scarecrows suggestions sounds like a good way to give you some good control lines to follow as well.

A power plane in the hands of a skilled craftsman should be able to knock out the wood core of two rudders and two straight dagger boards for an F16 in about the same amount of time.