I've finally gotten a mold made for my bmw e30 racecar trunk/boot and I am starting to plan out the layers of materials so I can infuse the part.

Are there any general recommendations on how many layers and core material to use? This will be basically just a skin part (I won't be making the inner structure like was done in that mini cooper bonnet video from easy composites) that will be pinned to the car. Obviously the car is only for track use so lightweight is the goal, without being to flimsy.

Thanks for your help!

Yeh just punch fairly small holes (I would probably stick to around 4mm) roughly 2-3 inches apart. You probably don't need to score, but if you want to be safe then just score very lightly between the holes with a ruler or screwdriver or something. Just enough to make a light groove, you certainly don't need heavy channels. Just keep in mind the more holes you put in and the deeper you make the grooves, the more resin uptake you will have and the heavier your finished part will be, and the more print through you will have.

Personally, I would consider doing it as a 2 shot process. Infuse the outer skin first, then remove the consumables without demoulding the outer skin, and wet lay vac bag the core and outer skin in place. This is actually a lighter method and will leave you with a better surface finish, but is obviously more work. Food for thought.