[keyle]

Yes if all your walls are individual meshes and you use large slabs for the ground (not the entire map being a floor).

If you're keen on this, I recommend using Trenchbroom for level design and the plugin that goes with it in Godot, it's pretty cool! (Qodot)

[lewispollard]

Though you can use the MultiMeshInstance node or SurfaceTool API to create and combine meshes at runtime.