So, I've collated some commentary and for future reference the key things to keep in mind when making a D/R bow are:
- The laminations must be pretty accurate to begin with (difficult if using natural bamboo, but we must try what we can, eh?)
- Avoid having uneven reflex. Smooth curves at the start = smooth curves at the end. This would be a manifestation of the above point being gotten right, in addition to having a good form/caul.
- At brace, the limbs should be actually or close to pretty straight
- Avoid putting in too much reflex. Having the tips around even with, or just in front of, the back of the handle helps to avoid nasty problems during tillering
- Go slowly through tillering - this done to avoid putting too much bend somewhere in particular, which can happen very quickly with a bow like this. Consider using a scraper of some sort. The accuracy of the lams to begin with helps reduce the amount of bulk stock removal, making the scraper effective.
- Know exactly what it's meant to look like at full draw before you start. This done by sketching, modelling or emulating another bow. This helps prevent hinges or overshooting the limb's curvature.
Are those the main points or have I missed something vital?