Hi Jeff, by the way a couple of previous guitar discussion threads that you may want to check out:

http://moi3d.com/forum/index.php?webtag=MOI&msg=3618.1
http://moi3d.com/forum/index.php?webtag=MOI&msg=2145.1

We haven't got to the filleting part of what you were asking about, but if you have something that's got tight bends in its outline and you want to have it rounded by a large amount around that tight bend, fillet may not be the best way to do that, you may instead need to kind of construct a rounded surface pieces by other means like lofting several profiles or something like that, I think that's part of those other discussions.

- Michael