making 2 or 3 at a time is a good idea and saves down time (if you like to make lots of bows, like i do!)
you can rough them all out at once, with table saw and bandsaw. Then if you heat-temper one, you have others to work on while it acclimatized, etc. Also, the way i've been doing here, you can make them all similar but with some differences, and see what you like the best. For instance, with the holmegaards, i determined that the best general ratio for lever:limb is 1:1, with variations for high poundages or low.
Today or tomorrow i'm picking up a red elm board (i had to special order it, it better be straight like i said, or no buy-ee!) and depending on how wide it is i'll cut it into 3 or 4 staves. Apparently elm is the bomb for recurves, so i'll make one or two elm recurves, and a holmegaard or two, using the 1:1 ratio...
elm is about 5.40 CDN per board foot. that translates to approximately 7 or 8 bucks per stave...hours of fun...cheap cheap cheap