If you want to show/hide the 3D view, don't implement an other view factory to avoid its creation. Just make it invisible in the createHomeController method you overrode, and manage the divider of the JSplitPane grand parent of the 3D view when you show/hide the 3D view.
If you allow me , I would like to answer the questions which are publish in this forum and help the others.
Feel free to help other users! All help is welcomed. 
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Emmanuel Puybaret, Sweet Home 3D creator
