Most what everyone else said: The top and bottom should match or at least have the same pattern...different size is cool. Orient the curly maple grain to match the ash grain (diff woods doesn't bother me).
The shape of the Zebra wood support is cool...I like it. Since the bottom is thicker than the top, the support carries that idea since it is wider at the bottom than at the top but the veritcal heaviness of the zebra disturbs my eye in trying to follow the support. I like the support shape, just not how you oriented it on the zebrawood.
As far as height, that is very subjective...I'll take your word on it!