To make the mold you need to first make a model of the part you want.
What I would do is use foam to make the base of your model, and then sculpt modeling clay to the final shape you desire. The model would be made on your hood to insure you create the correct shape. You need to make sure once the model is made you will be able to pull it off, this is accomplished by creating a die pull angle. For this part I would look at around five degrees to insure it from not sticking to the mold you will now create.
Now that your model is created you need to add a releasing agent, wax to the top surface of the model to help release the mold (of die) you will now create. The mold will be created by applying fiberglass to the model; you will reinforce the mold by creating a combination of fiberglass wrapped around a wood frame of 2X4’s for strength.
Now that you have the mold, you can now create the carbon fiber parts or have an experienced laminator create this for you.
I hope this helps.