Okay, RE: leefties palying with the G-string on top: Last summer I met a bassist at a country music festival, having seen him play a few minutes before, I asked him why as a leftie he played a right-strung Musicmaster bass. He said: "It was easier changing from upright that way" - which makes complete sense!
As for myself, I have always identified guitar and bass the normal way, and some time after starting, I realized that it's true when they say the guitar is a "right-hand" instrument. Once you learn the chords and left-hand shapes, the playing becomes precise and expressive with the right-hand attack. Depends on the style of course. On the other hand, the left, I am "bi-dextrous" as was mentioned - I pick berries and mushrooms on my left, holding the bush twigs aside with my right. I play cards with my left hand, holding the deal in my right. Etc.
As for myself, I have always identified guitar and bass the normal way, and some time after starting, I realized that it's true when they say the guitar is a "right-hand" instrument. Once you learn the chords and left-hand shapes, the playing becomes precise and expressive with the right-hand attack. Depends on the style of course. On the other hand, the left, I am "bi-dextrous" as was mentioned - I pick berries and mushrooms on my left, holding the bush twigs aside with my right. I play cards with my left hand, holding the deal in my right. Etc.

