Looks good to me. I would make a couple of suggestions. The lanyard groove need to be a bit deeper, in my opinion, to be sure the lanyard doesn't slip off. And the bell needs to be more defined. Again, my opinion. There are a lot of posts regarding this aspect of calls, and some have even shown that if you drill a 1/4" hole the call still works well. And it does. But the back pressure and just overall ease of blowing seems to be better , for me, if the hole is drilled out more. I personally use a 5/8" hole and then bell from there. In some cases, I may even use a 3/4" hole. But on a smaller piece, then 1/2" works fine. But I still like the end belled out in a nice looking flare. Just think it looks better. Sound better? Heck, I can't prove it, but I know it LOOKS better. But overall, a nice looking call.
But I'll be darned if I know what a 1/2" pioneer rubber sleeve is. Most of us use the reed sleeve made by JC Products. Got a picture of the rubber sleeve?