Ha, I already tried to build something like this in Boundless.
But I realized that voxel games (even if they have amazing sloping features ) don’t allow the equilateral triangular base that those builds require.
I did not mean a collaborative build as I’m well aware that & how it would be possible.
With communal I meant people building next to each other, forming independent builds in an vertical area.
(I don’t think that the house owners in the first picture all share access-rights to each others houses )
Good workaround for now is to use two beacon controls, with you owning both. Then you add a villager to the top one. It’s not COMPLETE INDEPENDENCE but it’s about as close as we can get right now.