useing starforge, i accidently made a wall using on instalation, start a map with substructure, then add a floor to it, if it looks normal screw it not working, next put roof right on top of that, than substructure again, and now u have your wall, you can repeat this as many times as you want, i did it twice and called it the great wall of china. explore this, make up something awsome, i dont care if you use the china idea, why i posted it. might be able to do it with other map types to.
Like this.