Anchor Bock is my favorite bock..i would love to brew a clone but I can't find anything on this forum or the internet in general. Just based on taste this would be my guess for character malts:
Definitely some chocolate
I think I detect a small amount of roasted barley
There's some caramel in there, I'm guessing Cara 40 or 60
I read somewhere they use a small amount of wheat, not sure I taste it though
Lots of munich of course
I would use Maris Otter to lend enough diastatic power to the grist
I would probably use as much munich as possible, filling in with maris otter to ensure sufficient DP, maybe 10% chocolate, a little less Caramel, and even less roasted barley. I'm not sure if I even need to throw the wheat in there.
There's a certain hoppiness that's unusual for a bock; I'm too new at this guess which hops they use.
Lagers aren't really a possibility for me so I would brew this as an ale; I would choose a very clean yeast, not too estery.