There are plenty of bucktail streamers or feather wing streamers (Matukas are cool) in the tying books and in images online. There are probably lots in the archives here at FAOL. They just have to look like a minnow after all. Using synthetics makes them even lighter since that material doesn't absorb water ("I want to fling those bucktail thingamajigs that don't look too complicated to tie"). Synthetics are easier to fling.
I saw Kelly at two talks at the Michigan Fly Show last March and so suggest you don't need to follow his example. He prefers to cast from a drift boat toward the bank (where there is cover) with large flies that splat upon landing, to catch big fish. So his flies - while being excellent for bass - are rather complicated and clunky for 'normal' trout.