Sat in airplane!!! (Sorry, no airplane noises). Chrismate dilligently sanded the tail horn all day long. I removed rear and middle top skin. Installed nut plates to rear bulkhead to hold fiberglass when complete and trimmed top rear skin even with rear of bulkhead. This will allow for the removal of the horizontal stabilizer without removing the top rear and middle skins. Deburred all skins and bulkheasds. Applied anti corrosion. Started riveting skins to airframe.