If you compare photo #1 (my plans) to #2, you will be able to see the differences in how the stabilizer was built compared to how it's now built. Photo #3 are the 3/8" thick printed Balsa sheet stock that will ultimately become the solid stab. Other than the more obvious, the leading edge went from 5/16" x 1/2"
Balsa to 3/8" x 3/4"
Spruce. My guess is that this was a weak point in the build that they corrected for. I now have all of the materials to finally build my stab! My new mystery to now solve, why do I have two sheets when I only need one??
Addendum: One more thing to clarify. If you go back to first post in this thread, take a close look at the second photo by increasing its size. Look carefully at the bottom center of the kit box. Can you read the hand stamped blue printed words? If you can't it reads; "MODIFIED TAIL". This further explains the revisions made to the tail in the kit. In my case, they (SIG) somehow forgot to replace the instruction booklet and plan with the newer version. Case closed!