Archtop Guitar: A Dilemma

As I prepared to begin carving the top of this guitar I found myself facing a dilemma, mainly because I don't know whether I'll repeat the exercise. Ideally, for a project such as this one, I'd own a range of gouges and a convex-bottomed plane or two, but I questioned whether their purchase could be justified given that I can't be sure that the cost would be spread across more than one archtop…