Riveted the drain into place today. Used the CS4-4 pulled rivets that were supplied with the SFSA kit. I counter sunk the skin side of the drain and dimpled the fuselage skin to accept the flush rivets. Also riveted the top end of the F-1028 BAGGAGE BULKHEAD CHANNEL to the F-1006D FUSELAGE BULKHEAD. This is because a hose from the A/C will be routed through a lightening hole on the F-1028 Bulkhead Channel. I'm going to have to think about the bottom rivets on the channel piece. I may need some help... Then I trimmed the Tunnel Hose Templates to get ready to drill the holes for the A/C Hoses.