Worked out the size of hole and grommet needed for the antenna lead through the turtledeck formers and drilled holes for these and installed the antenna lead. Riveted the forwards and aft brackets to the fuselage structure (so I wouldn't have to use angle riveting techniques to get them later). Then put the shelf assembly in place and riveted it on. Then put the ELT in place on the bracket and connected the antenna lead. Now it's done except for the antenna mounting and the lead for the remote switch. If you would have told me it would be 7.5 hours just to get this far in the ELT installation, I would not have believed it. Ok, so the bottle holder added an hour.