Worked on baggage door latch blocks. Set centerlines; positioned and match drilled pilot holes in forward block and firewall; clecoed in place. Explored access to aft block pilot holes. No access from below; only possible access was through the panel. Reinstalled pilot's control stick and removed Garmin EFIS screen, detaching pitot/static block and connectors. Wiring bundles were carefully pulled forward and down with string and secured to expose pilot holes.