Here it is. $45 version of the zip net. Yes thats a sleeping bag. My wife wouldn't let me use any of her blankets.
It works well without the sleeping bag but the balls will come out of the reservoir area occasionally from the impact if it's not there. I'll get a decent blanket to replace the sleeping bag and mark the lines in it.
It works great. The reservoir / trough area will hold about 40-50 balls. Then we just pick up the one end and pour them back into the basket. Thanks for posting the pic of the zip net for inspiration.