Hi all,
Newbie from the UK here.
I have been thinking for a while about making some parts for my car, and how to go about it. I have watched some tutorials on Youtube etc and thought it was about time I gave it a go, so I thought I would sign up here to get some advice from the experts. I hope you can help.

I have a 1980's Porsche 911 with a targa roof. I don't use the targa roof, so I was trying to think of possible ways to create a sort of hard top shell from carbon fibre or similar to go over the soft part of the roof. I've included a picture of an example of the roof how it is now.


Could anyone recommend a way that I could replicate the shape of this roof to try and make this? Or am I being ridiculous?! My initial thoughts were to maybe lay some sort of plastic sheet over it and fibreglass onto that to give me something to build off to create a pattern and then to make a mould from.

My day job is designing injection moulds for turbine blades and other complex things, so I can visualise how I could make a mould for this, and potentially if I can make a good enough pattern I will scan it and get one of the chaps at work to CNC the mould into modelboard, but I am just struggling to figure out how I could make the pattern.

Any help would be greatly appreciated, or if I am stupid for even considering this please feel free to tell me that as well!

Cheers.