This is a very popular fly for big rainbows here in Alaska. My biggest fish on one this past fall was 29 inches. I am not sure if there is a tutorial but check http://www.alaskaflyfish.net.
On the dali l. the white rabbit is not glued to the black. I do use tear mender for gluing rabbit but in this case, I think the fly has lots more movement without doing so. I also add UV minnow belly or uv krystal flash and it seems to attract more fish. Also, try using colors other than white. This fish was caught on a dali llama.