I play guitar left-handed and quite frankly I think that flipping the fretboard diagram, whether you're doing a top to bottom or end for end, is a stupid idea.
It is a well-established idea to have fretboard diagrams drawn out as if you are a right-handed player looking down over the top of the fretboard. I personally think it would make more sense to have the fretboard diagram oriented as if you're looking at another (right handed) guitarist across from you, but the convention is otherwise
When you go against established conventions like this, you introduce confusion. It's like if you wanted to write from right to left because you liked it that way better. You're only going to cause problems for everybody. Even if you only do it for yourself and your own personal use, you're still going to cause confusion for yourself when you go to look at other people's stuff when they're doing it the conventional way.