Through standardized base design that you can modify. In the same way that having the source code for vendor software often speeds up software development.
I think that would be more fun as an art installation than a home. Comments from the neighbours on the edit page would be wild!
But seriously, it looks like they're open sourcing their block designs to allow people to modify them, and any third-party with suitable CNC machining equipment to create them. Whether that's a Wiki is another question...
[1]: https://news.ycombinator.com/item?id=38915999