After one week out of the shop (due to my day job), back to the installation of the wingtips. First I drilled, countersunk and riveted the small trailing edge rib.



Then, as I choose to use screws to install the wingtip, I had to drill, countersink and rivet all the nutplates.
There are 38 nutplates, that's 114 holes to drill (3 per nutplate : 2 rivets and one centerhole), 38 dimples and 114 holes to countersink.
A lot of work to arrive at the result shown on the picture, where you can see some screws near the aileron bracket.



And I only did the right wingtip, I'll tackle the left one tomorrow.