Drilling on the horz stab skins

I have completed the assembly of the tail jig. It only took about 10 trips to the hardware store before I got everything I needed. I had this thing assembled before and where all of the parts went are beyond me. I got everything leveled and square and I had to shim the hinge brackets to get them to line up. The crossmember has a slight bow in it. As long as the rear spar sits level on the jig is all that matters here. It needs to be straight as this is where the elevators hinge on. Any offset will bind the elevators throughout the range of travel and that equals death in a airplane. I installed the stab skeleton and got it squared up and string lined the center of the stab to the centerline of the hinges. If all of the tip center lines are matched up to the same center line of the rear spar then there is no twist in the horz stab. If you have twist, then you have your tail flying through the air crooked and that causes more drag and less top speed. Once the skeleton is one and secured I install the skins. The RV-6 skins come prepunched and so does the rear spars. So these cleco right up. It's the rest of the skeleton you have to drill. I draw center lines on all the spars and ribs. This way I can see where my holes will be. I have several strips of plywood and thread all that I use to clamp the skin down over the skeleton. Once this is all clamped down I start drilling from the bottom up to push the skin up to the tip ribs. You drill yourself off the piece your are working on. That means that you start where the skin is fixed down- in this case the rear spar, and you work up and out to the sides. Doing this will help prevent puckers in the skins. This is not so bad on the tail but you can get in trouble on flat skins like the wing if you don't adhere to the this general rule. I drill the top of the stab skin first and then I drill the bottom. I have sticks and hooks to push/pull ribs as I drill to get the holes in the skins to line up with the center of the spars and rib flanges. It takes longer to set up the jig then it does to get the skins drilled on.