After conducting some research on deck planking, I discovered several features that deviate from the kit specifications and require adjustments.
Plank width
Upon comparing photographs with the kit plans, it is evident that the planks are more than double the required dimensions (https://modelshipworld.com/topic/39482-endurance-deck-planks-on-170-scale/). Consequently, I have decided to reduce the plank thickness to 1.75 mm.
Nails
It is suggested to draw nails at the end of each plank. Looking at multiple pictures I fail to see any nail.
By the time the Endurance was built in 1912, shipwrights used a technique called "Counterboring and Plugging" to hide all metal fasteners. Months in the Antarctic, the saltwater, ice, and coal dust weathered the entire deck to a uniform "silver-gray" or "charcoal" color, masking the circular outlines of the plugs. Plus the decks were frequently "holy-stoned" (scrubbed with sandstone and seawater), which kept the surface extremely flat and level. I decided to skip nails altogether.
Stain
The deck was primarily constructed from Norwegian Fir and Oak. Unlike the hull, which Shackleton had repainted from white and gold to a stark black (to make it more visible against the ice), the deck was generally left unpainted. When fresh, the wood would have been a warm, pale honey-tan or creamy yellow (typical of fir). But once the ship reached the Antarctic, the constant exposure to saltwater, intense UV light, and abrasive ice crystals would have weathered the wood. This turns the tannins in the wood a "driftwood silver" or soft gray.
The long gaps between the planks were made watertight using a process called caulking. Sailors hammered unspun hemp fibers (oakum) soaked in pine tar into the seams and then poured hot pitch or "marine glue" over the top. This created the dark, thin lines you see running the length of the ship in photos.
I treated the edges of each plank with graphite bars, subsequently glued them together. Following this, I sanded the planks to achieve a smooth surface. Finally, I applied a couple of coats of weathered aged wood finish, utilizing a combination of #0000 steel wool and white vinegar, which was left to react for two days.
Here is the result of my experiment (the picture lost a bit of gray). I feel pretty good about it and ready to start the real deck planking.