I probably could do it; I've been practicing on sport jackets. It might take me six or seven months to finish, though.
I've been working on a way to make pleats in the jacket that follow the back/side seams in place of the open vents. It takes in the waist a little bit up around the top of where the kilt is too, and you don't need to put panels behind the vents. There's still a flap across the back of the jacket but it is formed by sewing the front and back of the pleats together. The part of the jacket that is on the sides around the hips ends up fitting very well. The jacket wouldn't close very well, but, as Jock Scot has told me, you never, ever, ever, ever close a kilt jacket... So I guess it really doesn't matter.