I wish it were the apples the squirrels wanted, with 1500 trees there are plenty for them and myself. But i only have one walnut. But it was more than the walnut losses that wore a hole in the welcome mat. They were chewing holes in the poly pipe that irrigates the orchard. Very annoying and really unnecessary considering I have a tenant on the property that supplied them with food and water. And yes, everything is accessible to them. I've seen one jump 12 feet from one tree to another. I wouldn't put much hope in netting, they'd just chew through it.
Your solution, Sam, reminds me of another problem I had, wireworms. They were stinging my garlic and eating my potato crop. So, I did a bit of research to see what I could do about it. The solution was to put in a bait for them. And what was recommended? Potatoes. Needless to say, that ended my growing potatoes!