Gary,
All you are really doing is tying big streamers, mostly. Muskies aren't all that fly picky, they are mostly just hard to find. Lots of casts per fish, but if you can get a large baitfish imitating fly where they can see it, you should do okay. The big ones tend to prefer large flies. Even smaller Muskies prefer flies larger than the average pike wants.
If you want a 'big' streamer, something in the 6 to 12 inch ranges, you have to use long materials, or use a tandem fly.
To make these easier to cast, things that don't hold a lot of water are preferable. Long synthetics, Yak hair, that nice islandic horse hair, things like that. Feathers, quality barred saddle feathers and such in the longer lengths also are nice.
Hard to beat a 'deciever' style fly, but a nice color combination lashed to a large, sharp, strong hook is what you are looking for.
Personally, I don't like to fish with 10 to 12 weight rods for freshwater fish, so I stay away from rabbit strips that are longer than around six inches, they get too heavy to cast.
Good Luck!
Buddy
It Just Doesn't Matter....