All of the above sound quite feasable (I'm guessing this is still going to be a road-legal car)
As far as the fiber bonnet and bootlid go, there can be MASSIVE weight savings made (not sure about CQ's in particular) but I did have a friend with a Z32 300ZX, from memory the bonnet on that was comparable in weight to the one on my CGT, we took moulds of it and passed it on to a friend of a friend who made a really nice fitting fiberglass one... as long as it was balanced right, you could hold it up on the palm of one hand with ease.
The carbon sunroof idea sounds good too, if you cant find a CQ without a sunroof
Not so much as weight reduction, but weight shifting... how about moving the battery back into the boot? It wont really change how much moment-arm the mass of the battery has, as it will still be roughly the same distance from the back of the car as the existing battery is from the front (still with me?) but it does have the opportunity to move some of the weight rearwards and more importantly lower in the chassis.
Just thinking out loud there, as I have never seen inside the boot of a CQ, so I'm not sure how much less space there is compared to a CGT...