Kenessex and TenTwelve are right, Chip. That off-center tail-light looks unbalanced. It makes me lean over in my chair, and twist my neck back the other way, straining to make it right somehow. It is going to slowly drive all of us mad.
Maybe you could make a bracket that attaches to the under-seat frame rails, and extends out behind the cowl, so you can mount the tail-light in the center, directly behind the cowl. Or maybe you could find a pair of lights that have brake lights AND turn signal lights built into them, and you could side-mount those like you did in the photo.