Scout, The reason I made the hide removable is to let the hide dry out if it gets wet. Also, I didn't want to glue it on because of the chemical odor that might linger.
As for the ears, I had tried two other sets of ears that failed miserably. The bondo gets fragile and breaks easily. I had thought of different ways to do the ears so I could move them in different positions but couldn't get that to work either. The one place I did use glue was the ears. I used hot glue to attach the hide to the ears. The hot glue has very little scent in it so I wasn't as worried about using it.
Who knows, If this one works well, I may try to make another one. I wish I could use something to make it move but it's illegal in Missouri to use a mechanical decoy for deer hunting.