Tonight was another short session but I was able to drill all the holes in the stiffeners. I then clecoed them inside and marked the areas that needed to be trimmed from interferring with the bulkheads in the tailcone section as per the instructions.
All in all the instructions are well written and the process straight forward. I need to debur, dimple and prime the stiffeners as well as dimple the skins. Then it will be a matter of riveting the stiffeners in place and then rest assure that I can slam the tail down without any consequences haha!