Started work on the empennage fairing by first trimming the fairing to 1/8" from scribe line and sanding. The fairing fit well enough to not require any signifiant sanding. The next step involved locating the nut plate holes through the fiberglass using backlighting which was a significant challenge. I securely taped down the fairing and located and drilled #40 the aft two holes using a flashlight for light. Then, Cate crawled into the aft fuselage and drilled the forward three holes from the inside which I clecoed. I then alternately removed the fairing, secured a small headlamp to each of the remaining holes, then reattached the fairing, located the hole, and drilled #40 until all were found. Each #40 was match drilled to #27 and then the fiberglass holes countersunk for a #6 screw. Finished the day be beginning to install nut plates realizing it will be easier to do this with the rudder and vert. stab. off.