I did not get much done today! I drilled the rib angles for their respective ribs. I made sure not to repeat my mistake from the previous inboard flaperon and drill the holes for the root rib. These are defined by where the control horn gets situated. I got it right this time.
From there I measured the position of the control horn on the root rib – the control rod hole is centred 70mm from the tip of the rib – and drilled all the holes with the number 40 bit.