When looking at hull rivets do reflect that most were countersunk to reduce drag so are barely visible. Rivits on superstructures were sometimes countersunk and sometimes domed. Domed were used more on non naval vessels. WW1 Battleships had very smooth hulls and whilst the plate lines are visible its impossible to see the actual rivets as they were countersunk.
Ships had different types of rivets dependent on the structure. For large ships outer plating was often 1" thick in key areas which easily took countersunk rivets but higher up plating was about 1/2" so different types were used, domed, flat head etc.
A probable exception was the small tramp steamers which were built down to a cost and domed rivets were cheaper as the holes did not need to be tapered.
In my opinion hull rivets need to be done very discretely and many models can be spoiled with oversized rivets. We need to reflect on how big a rivet is in real life as its easy to overdo the effect.
Cheers
Geoff