Now we come to building the walls. Its a simple case of alternating between a 1x1 brick with a stud on the side and round plates. You don't have to use round plates, a 1x1 round will do just as well. I must stress the fact that you really shouldn't build any higher than 8 studs without strengthening it. I build to a height of 8 studs, then place some 2x16 plates as before. As you can imagine, this technique is quite parts intensive, you will need quite a few of those 1x1 bricks with studs on the side.