I think PastorD has more than captured the 'spirit' or character of Mr. Glasso's Sol Duc Spey. The proportions are wonderful, it's obviously dressed with great care and respect to the fly's originator - there IS a nice transition from dark to light (as per the original Rx) and I'd wager it would result in as many hook-ups as the 'original'.
So, sans 'GP crest for the short tail, teal face hackle, and GP crest as a wing topping'*, he's tied a lovely Sol Duc Spey that'll catch fish.
With all due respect, Humbug on nitpicking and experts who have to have the last word on tying.
*What is your source for these components in Mr. Glasso's original dressing of the Sol Duc?