cutting holes in the radiator shroud

[oaktree11]

Hi Guys,

This is probably another naive message from me but you will all be accustomed to them by now!

I am about to cut the slots in the fibreglass radiator shroud. Before I do I thought i would ask some advice.

I have trial fitted it and lo and behold, with a little trimming it fits! The rivnuts even align properly!

I see that there are "dimples" in the gelcoat which I assume are the centres of the radii for the ends of the slots. My immediate thought is to drill through these with a suitable diameter hole saw then cut the straight lines?

IMG_0116 by oldpropuk, on Flickr[/IMG]

What diameter is best, I guess larger is better for airflow but what looks best?

I am not experienced with fibreglass but I have found that my Dremel with a cutting wheel works really well at slicing through it.

Any help welcome! - John