Hi you must be finding better coffee sticks than I have!
For commercial boats the planking is straight all the way. You should allow for a curved single plank around the hull curvature.
In full size terms this would be about 3 - 4 inches wide and slightly lower in height than the deck planks, I should ignore this. It is what might be called the gutter plank and often any stanchions are located there.
For leisure class of boats and particularly yachts the planking is curved and follows the line of the hull. There is usually a centre line 'King Plank' at maybe double the width of the deck planks and often contrasting in colour.
The deck planks 'joggle' into this as they terminate. Check on the Internet for the way the joggle is cut if you need to.
Hope this helps