Dusky Blue Grouse Air Sacks ?

I want to mount one of the blue grouse I killed on my elk hunt and although it was killed in the fall, I want to mount it displaying.
I can not find a resource on how to do the air sacks. My plan, if I can't find some instruction, is to purchase artificial ones as reference and model foam ones to place on the neck. Use Apoxie-Sculpt to make the texture, paint, install when I mount it and pin and card the feathers around it to dry to expose the air sacks. I might just use the artificial ones.
Is there more to it than that?

 

Thanks for the input. Those artificial air sacks they sell looked like the would be heavy. I was mainly going to purchase them for reference in size and shape, so it's good to know I'm on the right track.

 

I have read the wingtips by wingman, but the pictures have been removed and I am a visual learner. I remember seeing an article in either Breakthrough or Taxidermy Today, but so far I can't find it by going through my years and years of magazines and I don't see it in the past issues index. I have not been able to find a video either at suppliers websites or on Youtube.

 

Thank you! I have a pretty good idea as to what my course of action will be and your post is heplful.

First, Breakthrough Magazine's website finally started working again, so I was able to find which magazine the airsacks article by David Luke and Eugene Streeksta.

I will order a blue grouse neck from a supplier as well as airsacks and combs to use as reference of size and shape and make my own.

I have tons of reference, so I have a good handle on what the outside looks like. I just needed a little insight to what the inside should look like to achieve the outside look.

Thanks agin for the input.