Bonnet Rivets (button head screws)

I've had lots of issues matching up different sized socket button head screws so they all match in the bonnet and bonnet scoop and give that rivet style look I am after. I think my only option will be to use the large screws for all and cut the bonnet ones down so they exactly match the bonnet scoop. The bonnet scoop screws are going to be held in place with Nyloc Nuts whereas the bonnet screws have been cut down to 8mm in length and will eventually be resin fixed in so they don't interfere with the bonnet rubber and rain channels.

Despite the issues I have now got the look that I am after and the spacing of the button head screws correct. All will be taken out and fitted again following paint, which is some way off!