Well yes, a scrollsaw will work better than a bandsaw because with a scrollsaw you can use a blade that is the same width as your metal. Therefore the metal is replacing the saw kerf you removed and this insures perfect alignment of all the segments. You also generally get smoother cuts with a scrollsaw, so your seams should be perfectly tight. But this doesn't mean you can't use a bandsaw. Did you ever try the "moo cow" like technique? That technique works awesome with a bandsaw. You stack two opposing colors of wood together and tape them. Then you cut half circles out of the sides. You take the halfs from the top and glue them into the bottom blank and the ones from the bottom go into the top blank. After the glue dries, you stack the two blanks again but this time you have them turned one time, so the half circles you glued in face up now and tape them together. Then do the same thing, cut half circles and swap the ones from the top with the ones from the bottom. It's a wild effect, like if you used ebony and holly, you'd have a blank that looks like a dairy cow.