Tintin
There are 2 types of IPA, English and American. You will find that the english one is probably a little more subdued than the American version, which is usually way over the top (but still very good). Maybe send an email to the brewery and as em what hops they use, or even if it is an english or american IPA. From memory, english IPA only goes up to about 60IBU (as far as style guidelines), and I dont think the americans put a cieling on their IBU's! I dont use any wheat in my IPA's and usually keep the crystal down around the 300g mark to stop it from being (IMO) cloying. That looks like a pretty good recipe, but if it is for 23L, and your boil grav is around 1070, the cascade will only give you 16 or 17IBU. I would shoot for some Target (11%) to around 60IBU for your bittering, but that is just me. If I were to be making an IPA to about 1080, I would aim for about 80IBU, but you may wanna aim lower, it is all personal taste. I have never tried this beer, nor heard of it, but it is good to hear that there are plenty of micro's popping up, can only be a good thing.
All the best
Trent