Coming from a background (work wise) that makes me want to shield everything I have a new opinion on this subject. As I promised Jack, in the interest of science, I did my latest build without shielding the cavity, only the pickguard was shielded since it came that way.
In one guitar I copper taped every last millimeter and left not one area for interference to get in. In another guitar I did nothing. All the electronics were the same and the pickups were the same. The result was that there was no discernable difference. Maybe I don't play in areas that it would really make a difference but I can honestly say that I could not find any difference.
I can understand the desire to do it, and support it, but you can always do it later if it needs it.
There ya go Jack. I keep my word, and you, were right.
http://www.unofficialwarmoth.com/index.php?topic=1481.0