Body instead of Olive floss: Olive dubbing — Easier than floss, floats better; Olive thread wraps — Slimmest profile
Underwing instead of Wood duck flank: Lemon wood duck (dyed mallard) — Easier to find than real wood duck; Gadwall flank — Similar barring, widely available
Overwing instead of Mallard quill: Mottled Thin Skin — Much more durable; Turkey quill — Different mottling, same shape