Hi all!

If you are planning to use 2/2 twill carbon say 200 g/sqm, then a glass fiber 2/2 twill with similar size (optically) strands should drape very similarly. I dont know what your mould looks like, but I cut the fabric a little bigger anyway, trim off the excess once it is stuck in the mould. leaving some extra on the flanges to trim nicely. 

I may add to my post above that the layup planned is to be into a quite complicated mould. I'll be laying up the first fabric layer into the (5-piece) mould while it's separated into a "top" and a "bottom" part, and then join the mould parts together. Carbon tape will then be carefully used to join the first layers, and subsequent kevlar and cf layers then added. In short, this puts a huge emphasis on my templates to be as accurate as posible, leaving the uncovered area between the mould top and bottom as small as possible.

Ahh... I see, I read this post after your other reply. If it is such a complex mould, and you wish to use honeycomb straight away, I think you are looking at a VERY difficult and messy process. I would suggest using soric core and vacuum infusion technology.