Finish to drill the nose skin (top side). Since the nose rib are not attached together with a stringer, it is a bit difficult to align them to drill. I use a scriber and position them in order to see the black line in the predrilled hole. It is time consuming but the result is good.
I positionned the stiffener K330 between the rear edge of the top skin and K331. Hold everything with clamps and drilled every 32mm, hold with cleco.