Alan frames were aluminium tubes in aluminium lugs and almost all their frames were under tremendus pressure because all the lugs were the same angle for a 54cm frame and if you built a different size frame, the lower head tube lug and the bottom bkt angles were wrong so the tubing would be bowed.
I thought the problem in gluing metal tubes and lugs is that the epoxy is more rigid and brittle than the relatively flexible steel or aluminum tubes. Hence the occasional failure of those glued al. frames? The Alan frames used glue and screws in the joints, that may have stiffened the joint...
Or perhaps better epoxies are more compliant, like brazing filler?
Anyway, here is a video of Colnago gluing carbon tubes in carbon lugs:
http://www.youtube.com/watch?v=MRt4p...layer_embedded. My guess is that carbon is generally stiffer, and perhaps has similar properties as epoxy?