I am not too fussed on the predator planet, too over the top really. Having lava that close to the buildings would seriously cause issues, to elaborate what I mean, lava is just so hot that you would be dead just by being meters near it.
You clearly didn't play enough with this little gem.
All seriously though, since their planet has such intense volcanic activity, I can see Yautja dig canals to control it, maybe even harness it in ways for a power source. Therefore I see those buildings more as controlling structures.
Plus apparently humans can stand 2 meters away from lava. So I can visualize Yautja standing 1.7 meters away and say "Ahhh, this is nice!"