If you still have the bottoms of the quills intact you're all set. That's exactly how I do all my fan mounts, got the idea out of a Fur-Fish& Game magazine and it's awesome. I take each tail feather out and clean off all the meat, then lay it on the table where it's supposed to be in order. Then I do the same with 3-4 layers of the other tail feathers, and set them aside. Cast the main feathers in two-part fiberglass boat repair (lay them on wax paper), then after that dries hot glue gun the rest of the feathers on a layer at a time, then mount it to a wooden plague, it will come out as flat as possible and will never rot from meat spoilage.
I think they come out great, here's a few photos of the process, I took them cause someone else was asking me how I do it that way. The first photo is the main feathers in fiberglass and the first layer of secondary feathers with hot glue
