Given a suitable budget it would be interesting to experiment with laminates and weight placement in a carbon rig. Assuming you need to add weight to the mast to make the tip weight requirements deciding where to put that weight could have a big effect on the dynamic response of your mast tip. Stewart, if you're interested track down Damien Smith (I think he's still in Perth) he did a lot of research on this topic for his uni thesis and is a bit of a boffin.