Thanks for that great description. I haven't tied nearly as many as you and others who have put a great deal of time and dedication into classic mixed wings but I have tied a few and such advice would have been great to have.
I recall that the little things make such a difference in tying classics. Steaming the golden pheasant tippets, stacking each wrap of the herl for the butt, folding the hackles, picking the seal, etc. Russ' offers some great advice. Good luck and hope you post the results.