Doug,
Randy is right, I did draw all the modern Shark kits. The two Sharks are similar, but there arer some subtleties.
I would not put in a lot of stock on the difference in square inches, because the listed areas on lots of older planes is just plain wrong. ACAD does the math and the area is 676 squares. I've seen Shark 45's listed anywhere from 650 to 700 squares in different sources.
The nose and cowl on the Jetco is flat across the bottom, where the RSM kit droops the nose a bit, and to me looks a little funny. I build my Shark 45 as the Jetco version, because I liked the look better.
As far as "modernizing" the airfoil and/or moments, that is absolutely not needed as Lew's design on both the S35, and S45 are as modern as can ask. The airfoil is spectacular and the TVC is in the .420 range which both add up to a modern, top competitive combination. The S35 with an LA46 is my favorite all time classic plane. I will build another one.
Pat Johnston
Skunk Works