When I started to explore dice building as a concept I was actually thinking about making a board game. I quickly realized that a digital game would work much better, at least in single player. It's just much faster and less fiddly, and you can do some cool things that are very hard to do with physical dice. There are some popular board game dice builders (Dice City, Too Many Bones, Dice Forge etc) but I haven't actually played any of them. I probably should :)