What makes a signature guitar successful is not just the name on the headstock but what that name is looking for from the instrument, and how their preferences resonate with the guitar-playing public at large.
You can put an A-lister’s signature on your headstock, swap out the stock pickups for the artist’s own, maybe apply a custom finish, and it’s job done. There’s your marketable signature model, complete with the artist kudos that we have recently discovered makes guitars hold their value in the used market.