Marked the firewall contact points with blue marker to ensure visibility though the skirt holes. Fit canopy skirt to fuselage, aligning front cutout and rear to longeron. Matched drilled forward-most 3/8" bolt holes and cleco'd. Measured 5/8" firewall overhange from plans and carried the dimension around the forward edge of the windshield skirt. Drilled with #40 through SST firewall and cleco'd.