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I think it needs some kind of sub base, even if just to get the levels right. My experience of type 1 was that drilling a hole in the bottom of my pond to drain it didn't really work, very slow. I live in the wettest city in the UK apparently so it's top of my mind to get drainage right.
Anyway called a local supplier, they do type 3 but didn't have it on their website. I'll use a couple tons of that.
Polygon
I was assuming just soil between the slabs with grass or sedum or something. The runoff would soak away pretty quickly I expect.
If you want gravel between them then yeah, whatever @ColinTheBald says to do