I got to visit Jim Betts boatyard last Friday, and also find out the foil story. Richard was right in an earlier note. After they strip plank the plug, instead of spreading resin on the strip and sanding it, they foil it. The foil is squeegied down like laminate would be, then mold release is added.
At first I thought this part was one of the Perry monohulls. Joel had to explain to me that it was the topsides and deck of the stretched 37 that I designed for him. With the reverse bows.  Notice the foiled lower part of the hull in the lowest picture, to the right.