Match drilled the bottom/floor skins. Match drilled the F-824 aft side skin to the F-887 upper longeron. This is where I noticed that for some reason I had forgotten to install the F-812 aft bulkhead assembly. God only knows how. A little fiddling and I got the F-812 installed and match drilled to the bottom F-828 skin and the finished the F-887 longeron drilling. A good day, though I felt sorry for the compressor having to go flat out most of the day. Check out the photo though: NO CLAMPS :-) Tomorrow night I'll see if I can finish up the drilling of the F-824 aft side skins to the bulkheads.