Nah, nah. Look what he did. You have fairly straight string pull on the high strings, where you need it for bending. The bass strings have a crooked string pull, but it won't matter as much there. It's brilliant. As for strength, I wouldn't think there would be any problems. Again, it's heavier on the bass side, where you'll have more tension.
If the headstock were symmetrical, there might be a different story.
-gjdk-, if you can build half as well as you can design, you could end up being a rather impressive builder.