Should I be worried about these bugs in my hardwood stack?

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Just don’t touch them with your bare skin and you’re good.

They’ll sting the shit out of you otherwise.

I had one of those on my back when I was really young. I let it crawl around and I had a huge racetrack of red inflamed skin on my back.. good learning lesson I guess

Once the bugs are gone, I would put the wood in a freezer depending on how long the pieces are. If it layed eggs in it, they will hatch in your project. Freezing is good, but there are probably better options

Sycamore Tussock Moth caterpillar - eats sycamore leaves