It's another post on my channel. But they patched the ability to assign channels to 🎈 balloons.

@@zachslegofortnite I think they patched it bc it was very buggy. I’ve never had an issue with a vehicle ever and with the balloons assigned to channels my plane fell through the map and killed me.

No, you don't need to use the granite. If you want to be safe, build a double thick wall.

Mos eisley detailed support