As Bill noted, the Drawings & Specs page in the rules for the rudder say the offsets are minimums and half widths may be two mm greater. There is also a limit on the trailing edge of the keel and rudder (5.5.4 & 5.6.1).
That's a pretty tight spec. As Mark points out virtually every factory keel excepting maybe those on single digit hull numbers would probably not comply. I think the same holds true for original factory rudders, though those from our our new supplier may. Sometime in the 1990s the Annapolis fleet measured a dozen or more boats in our fleet before Spring launch. We found what you already know, un-faired keels were short in the chord and fat in cross section and those that had been faired were spot on the templates. Rudders were generally just fat.
