The rivet call on the upper horizontal angle is a #5 but it really should be a #4.5. I used my rivet cutter to cut #6 down to a #4.5. The center rivet in image 2 is the #4.5.
I have not riveted on the bottom hinge yet. I’m going to wait until I turn the boat, or is that flip the canoe? I want to fit the seats in the fuselage and see if the angle is right before I rivet the hinge. If I have to tilt the seat a bit then I can adjust the hinge holes a bit to do that.