Not sure if you posted this in the facebook group as well, there is an almost identical post from a similar time.

You've built your stage very far away from the origin point (0,0,0). You can see the slightly thicker cross in the wireframe view as the indicator of the origin.

When you add a view to a plot, the default view is a top down (plan) view directly over the origin point. If you manipulate your view using the zoom and pan tools that appear when you select the view, you can move the viewpoint so that it shows your stage.

You should ideally model closer to the origin, because it's better working practice, and also because it can make modelling easier, as you can use the x/y/z axes as lines of symmetry for manually adding things and for the mirroring tool.

This is a screenshot from your project, the only thing I did was adjust the view position using the pan and zoom tools at the bottom of the selected view.