Re: Fly Dressers Guild
When I was a commercial tier, I recall getting a letter from someone who was attempting to form such an organization, but don't know if it ever got off the ground. I didn't join, and have not heard of it since.
The Federation of Fly Fishers is likely about as close to such as you'll find in the US.
Remember, no one likes to be behind the big truck, but that's better than being under it!