Well its for an RT so im thinking making just a thick pouch and also a lure in the shape of a bird. And making the wings so that i can attach real birds wings to it, and also making it so that the meat it attached at the head. I once heard this other falconer did it that way to teach to bird to grab at the neck. Dont know how effective that is but it sounds logical to me.
"Knowing the other and knowing oneself, In one hundred battles no danger" -The Art Of War
i just use rabbit/hare hide (together with the fur). i stitch it at the belly and fill as much as i can with cloth (mostly my old pants ) than, at the place where the head would be on a live hare, i stich a square patch of leather with laces in the middle (for the tying of meat), and than tie the whole thing to a leash and swivel. that way it looks a lot like the real thing to him. but if you want him to hunt birds then i'd use the bird shaped lure mentioned above.