Most use bright dyed feathers , we have them in full size 12" turkey feather that can be cut to 3-4" feathers..
you can use any shaft but need a flething jig to save you hours as done by hand takes skill and time...
Flu Flus can be 3-4-5-or even 6 fletch/feathers most jigs fletch now in 3 fletch...so for flu flus that jig will do 6 fletch...minor adjustment...the more feathers/fletch the more effective the flu flus...
I suggest at least 4- 6 full cut feathers...
they can be helical..which are very noisy or straight both work well with six feathers...
below is CX store bought..
Neil