What weight saving have you seen by going down the full CF route?

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I also need to modify this one a little bit. The car has a custom made lightweight windscreen with internal heating which is a different size to the standard windscreen, so there is a 20mm gap between the stock fibreglass roof and the windscreen. So I'll be modifying the roof to bring it back down and sit under the seal again. I also need to find 10-15mm of extra headroom as the driver currently hits his head, so I'll likely be chopping a large section of the inner skin out. 

I've had a look at the car I'm doing now, starting the job next week most likely. Luckily the Exige roof is not as big a job as this, it is really more of a bonnet. Will be a 2 piece mould with an inner and outer skin. Surface area is roughly 1sqm, so not very big either. 

Id estimate its cost me in materials around £10k to do my entire car, that includes the mould materials, consumables and 'learning' curve errors... and included in that a small stockpile of materials left over to make more parts.

I did manage to find pretty much exactly the same job has been done by Nitron in the UK. Looking at their pictures, it looks like it will actually be closer to a bonnet than what Andy has done here anyway.