Art. Many years ago I added a 7th string(octave G )to a Martin 0018. The flack I got!! I tried to explain to folks that the guitar was my working tool and I liked the sound of it, but I think it just offended folks that I'd butchered a Martin. Years later when I added 2 strings (octave D and G) to a Takimine nobody said a word. I've put a light tortoise-shell DOUBLE pickguard on my old 0-18 and I currently get some raised eyebrows, but Josh White was my all time guitar hero and I tell folks it's a tribute to him. Most say "who's Josh White?" Guess I'm just a born "tinkerer".