You don't state whether you intend building a pointy (Florentine) or rounded (Venetian) cutaway. Each style has it's own unique challenges, but whichever you choose, I suggest you to give a lot of thought to the design of your headblock.
Having a firm idea of the neck width and taper where it joins the body will determine how well your cutaway transitions into the line of the fretboard edge. Ask yourself whether you want the sides to be flush with the fretboard edge there, or if you want the fretboard to sit inboard of the cutaway edge. The angles and dimensions of the headblock and the placement of the dovetail pocket need to be carefully considered to take these factors into account. Side thickness should be factored into the design too.
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