Your fly will look and fish great with a little fine tunning as has been suggested, however I do have a question for you. Are you trying to create a slip wing wet fly here or just bunches of the flank separated into a Delta or Dee type wing? Given time and with lots of practice I became quite good at using mallard flank for a flat wing fly. The pattern below is a Hare's Ear & Pheasant thing I make for trout & grayling.
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Here are a couple more shown using both dyed and natural flank as a wing, I post these to you to demonstrate the wing slips in various postures. This fly with dyed flank has an under wing made from a pair of Golden Pheasant body feathers. They add color and some bulk to the wing when the fly is swimming.
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This would be a sparse tie with just the flank standing alone.
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