Well, the fins supplied with the Estes kit aren't scale in size, but neither are they really scale in shape either. There's more detail to them than Estes cut with their die. I did redraw some better fins for my model based on ROTW, but they turned out hard to cut so I gave up.

On another point, doing the double lamination thing is good for a couple of reasons. One is that it gives you a semi-rigid center point to sand against when making the knife edge, plus it is easier to cut a thinner piece of bass or balsa than the thicker stock.