I finished cutting all the main rib (rights) and prepped them all by deburring. I match drilled the hinge ribs and also riveted on the doublers on the most inboard main ribs (left and right). And then I began riveting the ribs to the left main spar as called out in the instructions.
Made one mistake by accidentally selecting one of the ribs that had been matched drilled for a flaperon hinge rib and putting it where a regular rib goes.
Rather than drill it out, I simply left and match drilled another (right) rib instead and installed it per the instructions.
Thinking maybe I should've ordered the fuselage kit by now.
