My feeling is that you need to track down someone who owns something like a DaVinci or Calfee or Precision CF frame and go over it with a fine toothcomb, calipers and camera and record every dimension you can. Then translate that to your plan.
Check the thickness and diameter of the CF where possible (eg, seat tubes). Look carefully at their dimensions and angles. If you happen on naked CF with the frame, check the lay-up at the junction of the lug and tube for any clues on directional changes in the cloth. Check the weave and quality of the cloth that's used.
You probably won't be able to imitate everything you see, mainly because of the different technology used to mould everything together, but a good lugged tube replica should turn out OK. You might also need to consider additional diagonal tubes in either or both of the diamonds to compensate for any weaknesses in your own frame design and construction.
Again, these are just thoughts that would run through my mind in planning a venture such as this.