You can get a paper template from Harry for the outline shape of the board. The cross section is a little tougher, but be sure to not make it too sharp. The leading edge is about 1/4″ thick, 1/4″ back from the edge.
These are very approximate guesses. The cross sectional profile of the leading edge is the same from the top, near the boat, to almost the tip of the leading edge. You should be able to pattern it after a section that is good further up.
Harry can also answer your question on the rails. I think the peices used on new boats are longer, and are only short as parts, to make them shippable. I think the new boats only have two sections per side.