Squared Skeleton up and helped keep front spar in place by butting blocks up to the ends and clamping the blocks to the table.
Layout rivet lines on skin by measuring skeleton. Pilot drilled all holes in skin first clecoed to table. Pilot drilled & clecoed rear spar first, starting from center and working out 1 hole at a time both left and right. Pilot drilled & clecoed ribs, starting from center and closest to the rear spar from center out both ways, then the second from the rear spar, third etc. . . Finished up the front spar pilot drilling again from center out.