That looks really interesting! I hope it all comes together for you!
If you'd consider buying a good dash rather than making one, I'd recommend Prestige Autowood (
http://www.prestigeautowood.com/). He makes beautiful dashes with a choice of several different woods. He finishes both the front and back, as well as the edges of the holes to protect it against moisture, he includes all the lettering, AND he will do custom designs. The quality is really top notch. Maybe you can get an idea of the kind of work he does from the attached picture.
He made my dash which includes a glovebox door and an extra hole for a gauge but what's more interesting is that he was thinking about making an instrument binnacle from wood. That didn't turn out to be practical but his willingness to do something totally different impressed me. I'm sure he would be willing to work with you. but the quality of the dash impressed me more.