kydave:
Why don't you shave off the curved sides of the Guild's headstock, cut the top off straight, then remove the pearl inlay and take the black background down to bare wood, apply a Martin label, and refinish the headstock? That would suit your aesthetic sensibilities wouldn't it? I mean, what you are essentially doing is trying to make the Guild headstock into a Martin one in the first place, right?
If the Guild headstock is not to your liking, then sell the Guild to somebody who can appreciate it. If you want a guitar with a Martin headstock, then buy a Martin, and don't hack up perfectly good Guilds to suit your sense of aesthetics as seen through Martin colored glasses. Guilds are NOT Martins, they have their own look, and their own sound, and they are built according to Guild's designs. If that look, sound, or design is not to your liking, then get something that is, and leave the Guilds for people who can appreciate them. It would make better financial sense, and prevent the alteration of a perfectly good Guild.
You are proposing the same as somebody who would come into the Martin web site and ask if anybody has reshaped a Martin headstock to look like the open book Gibson style headstock. It wouldn't sit well with the Martin faithful, and your proposal to modify a Guild headstock does not sit well with the folks around here.
Kostas