Your browser does not seem to support JavaScript. As a result, your viewing experience will be diminished, and you may not be able to execute some actions.
Please download a browser that supports JavaScript, or enable it if it's disabled (i.e. NoScript).
As the title says, it seems to be impossible to use the customization options in simulation mode to create a StructureNuker. Clicking a space simply does nothing. (I have tried in both Chrome and Firefox.)