To answer directly, Yes, to me, it is much easier to plank a ship that is larger and easier to build as well. This is just my humble opinion. You have more area to work with - the parts are not so tiny. However, due to the larger size, there is going to be much more attention to details than you will have. The pulleys and Blocks will need more detailed rigging as it starts to become more realistic and more scale-like. The much smaller ships can only afford a "representative" of things. A larger model ship will lend itself to more different sizes of rigging line as you can now tell the difference - however a very small scale usually only has maybe two different sizes of rigging line as you can not tell anyway from the scale being so small UNLESS you are willing to go to the extra effort to find very FINE thread type material. On larger scales, the different line sizes are readily apparent as the different sizes stand out more. So, I think the point is made. Ofcourse I am leaning towards the three-masted ship of the line types. The Viking ships of that type are only going to have perhaps two sizes of rigging line at full scale anyway and also depending as the others pointed out the era, type of ship, and country.
A half-inch wide planking strip is going to be a huge model perhaps at 1/24 or more scale which would be gigantic. On a more serious note, most all of the larger-scale ships that are about 48" long or about 1300mm, (1/90 or 1/85) the Deck Planking would be about 3/16 or about 4-5mm. The Hull planking on that same size model would be about 7 or even 8 mm or .30 inches.
These are approximate given the type and era and country of origin of the ship - this at least gets you in the ballpark of the largest ship model I know of. I am sure that I will be corrected on some of this data, but I might be close.
For instance, the Santisima Trinidad (just using for rough example) is a 1/90 scale ship. Now, the deck planking was about 1/8 inches or 3.175mm and the Hull Planking was about 5mm or almost 1/4 inches. Now, this DOES NOT make the Trinidad model "correct" as I am sure that it is not. I only used it as an example. Most all model manufacturers I am sure have constraints they work within.