Thanks for the replies, I'll have a play around with the rivet effects, they do look a bit too regular.
I did consider doing the D Day stripes "painted yesterday" but HTC usually like the skins to look well used. Still, I should be able to move the stripe layers up over the weathering and try it fairly easily. I've just had a look at some close up photos of a D Day striped Avenger and could easily see the rivets etc. on that, so maybe the FAA sprayed their stripes on.
Thanks again for those pics you sent me Nexx, found all sorts of useful stuff on them.
I'll do a template, but not until after I've got all the F4F skins I want to do finished. I also intend to put all the different F4F engine/wing/cowling combinations in the template.