Today finished the horizontal. At this point I have become very comfortable bucking rivets and feel very confident in doing so. With only a couple drill outs needed, this came together pretty quickly. Whew what a lot of rivets. Before I learned a little trick(you'll see later on),you can see I scuffed the living sh!t out of the front spar. Should be ok, no real gouges, just ugly. In the same picture you can see the shop heads on the front spar rivets, not shabby. FINISHED! I was surprised at how heavy and sturdy this thing felt, great design. **One side note that I found helpful, I went off from the plans here and left the center rib out, I believe it was 708 while riveting the skin to the front spar. It gave me mounds more space to work with, worked great for me but YMMV.