Thanks for the comments, everyone.
Seligman, what I notice most re the color is FVM brightened the orange. I have these MU'ed with some Katos and the color discrepancy is not nearly so bad as on the ES44s. Of course, the prototype is all over the ballpark anyway...
Mike, a lot of it is the angle but if I were gonna be fanatic about it I'd put LEDs in the headlight positions also. You lose a lot though that light pipe. The bottom lens especially is markedly dimmer. I could also have increased the size of the resistor and dimmed the ditch lights down a bit, but I like them this way.