i just put this on tap today and it is FANTASTIC. i bought a 4-pack of the real thing to compare and it's very close -- i would definitely say this recipe is right on. i'm going to be doing this again soon for sure.
i did make a couple of changes when i made mine. The first is i used chinook for bittering (didn't have any nugget) and went with a full ounce instead of 0.5. I know there is a question about the claimed/actual/perceived IBU. I would say go with the full ounce. However, the second difference is that I did not add any coffee at secondary/bottling. That certainly has some effect on bitterness. Either way, I'm definitely going to make it again, and when i do, i will do it exactly the same way as I did this time. Also, I used wyeast 1728 scottish ale yeast just because i like wyeast