Yes, there is a 3mm concave and it has been generated from the rocker table. I made the rocker table with screws that give it an adjustable characteristic allowing me to choose the concave I want.
Great looking board! How did you get started? Any pointers/books/dvds/articles that you'd point a newb to? Do you have any photos of your adjustable rocker table? That sounds like a great idea. Thanks!!