>>538377023
I usually don't go lower than 2x2 so it's not that bad, but yes it can get tedious. These arches are the most complicated ones the rest are stuff like making each side of a wall have a different texture and those are fast. I might go back and add more details at some point, but that's a long term project.
I don't use them, but there are mods that make chiseling faster. Even save designs so you don't have to chisel 100 blocks manually.