Thanks again everyone for the feedback and the interest:
Tag, tail and butt - Small flat, or fine oval gold tinsel, a topping with wood-duck veil. Black herl over the tie-in point.
Body, hackle and ribbing - Small flat gold or silver tinsel under white floss for the rear 1/3. Then white seal followed by olive/brown seal mix to approximate the light brown of the GP tail feathers for the balance. Ribbed with Med gold oval followed by a long/skinny grizzly hackle from the first turn. Same with the dee except white for the rear half and olive/brown for the balance.
Collars - Two or three turns of white marabou clipped at the tip to length and wound full followed with two turns of folded wood duck or gadwall flank.
Underwing and married wing - Sun bleached or white-tipped turkey tail under white goose, light and dark bustard (in slips, 3 goose barbs: 2 bustard) and GP center tail.
Dee wing - A topping extending to the veiling under slips of sun bleached, or white-tipped turkey tail.
Sides and roofing - Wood duck slips divided and married to a slip of mallard flank. Bronze mallard roofing and a topping.