Ken, i didnt have any mesh in my grills for SVA and didnt have any problems, because the edges are effectivly inside the perimeter of the body i dont think it matters.
I got some stainlesss mesh for my grills from RS its the same as the mesh that Chris (IOW) has used on his car, do you remember that honeycomb shaped stuff his had at stoneleigh?
The rear side air intakes ive used the phantom grills on.
For the sva a couple of things i had problems with:
The heater knobs, make sure they dont stick out the dash too far, if they do it wont pass the radius test thingy. Between the faceplate you mount them to and the face of the heater controls leave about 5mm, then theyre ok.
He did comment about the opening around the handbrake, but let it go because he said it was obvious id be trimming there. Maybe put some kind of gaiter on it just for the test? same goes for the gear lever.
Leave the door card off one door, they will want to see the markings on the glass and its only possible with a door card off.
The rear quarter windows, the front edge on them doesnt have enough of a radius, this they didnt like, it may be possible to stick a bit of rubber onto it with a radius, alternativly take the fuse out the electric windows, so they cant put the window down, the car can only be tested as its presented, therefore if they cant open the window, that edge without the radius is no longer a problem. i didnt do this for mine, but i said id do it and then he said he'd pass it.
Alternativley, if you havent fitted them yet, get down a glass merchants and get the edge ground.
For my test it was very convinent that the car was pratically on the floor, it was so low he couldnt get it on the ramp, and therefore did no inspection underneath
Again there was another radius issue with the headliner, where the holes are cut in it it didnt quite touch the roof, this gave too small a radius, however again because it was going to be trimmed he wasnt bothered about it.
Might be worth putting some soft stuff over yours just to be on the safe side.