Road ideas 1. didn't work. They don't work, and the details on the roads are easily lost. 2. is an interesting one. it kind of works, but would be a total pain to code 3. is the most likely to work from a coding point of view. And I like the way it looks. The challenge is to create a piecewise system.
As we saw a few years ago with Chuck Stover's work, Shapeways and printing have become a go-to source for unusual dice designs. Here are some eye-catching stainless steel pieces on Shapeways by Ceramic Wombat: I'm guessing you roll this one to get bett