Very often, one may come across a stray sewing machine without a table. In order to safely store the machine, one should build a small box around the base, and possibly a case around the entire machine. The following links describe how to do so:
https://www.instructables.com/id/How-to-Make-a-Custom-Sewing-Machine-Case/
https://theprojectlady.com/singer-sewing-machine-wood-base-tutorial/
Sewing With Nick 