Yup! As was said, they're just cattle fence made into round cages. The bottoms I lined with some landscaping fabric for a growing medium (75/25 compost/soil) and planted the potatoes about half way down. From there I just mound up in straw.
Edit: I forgot a few details. They're held up on either side by t-posts. Nothing fancy, just driven in and wired to each post three times (top, center, bottom) for stability and support. I put sprinklers on the top because that's what I had, though I do want to do something different in the future. I don't like top watering, but I haven't quite figured out how I wanna do it otherwise. I'm thinking a strand or two of drip that gets mounded up with the potato as it grows, but that's experimenting for another time
There's some folks that will actually do a core of medium up the center for new potato roots to take hold in. I'm trying something that's a little more fertilizer-intense, but easier to scale up. Little blood meal every couple weeks while they're growing up then some 10-10-10 twice (once at the beginning and once again here in a bit).
If I can make this work in my home garden, I'm hoping to tweak it a bit for larger scale. We'll see