Close up view of the drilled stringer channels.

Big thumbs up for a job well done. Stringer channels drilled completely.

Here, i flipped the wing over again right side up before drilling the stringer channels on the left upper skin after making sure that the centreline marking was visible through the pre-drilled pilot holes.

Trial fitting the stringer channels after flipping over the wing with the upper skin still clecoed.

The additional rivet holes were drilled on the left upper inboard skin stiffeners.

Again stopping for a photo break after finished drilling the left upper outboard skin stiffeners.

Close up view of the drilled upper skin stiffeners.

After a tedious job, i managed to finished drilling the upper inboard skin stiffeners.

History repeats for the upper skin stiffeners..

I have removed the lower skin clecoes, flipped over the wing and reinstalled the upper wing skin.

Here, i drilled the front spar holes with #30 drill bit. Due to insuffient clecoes, i drilled only a few holes. Have already ordered more clecoes from US Tool from GArdena ,CA( cheapest at $0.34 per piece)

Work accomplished.

Drilling in progress...

This photo shows the left inboard wing skin with the skin stiffeners' additional rivet hole markings , ready to be drilled.

These are the two lower stiffeners on the left lower outboard wing.

Close up view of the drilled lower skin stiffeners.

With no helper, i need to consciously hold the wood while i drilled using the other hand. Perseverance is the key .

The wood you see here was used to provide a solid support for drilling as per the manual instruction. The stiffeners shown have been completely drilled.

With two side grips, the skin stiffener was aligned properly before being drilled.

Followed by the cove ribs..

Drilling the lower main rib.

Stopping to take a break after finished drilling the lower aft spar.