It would be much easier to just buy some pre cut vinyl star stencils (Eduard and others), photo-etch template/stencil, aftermarket waterslide or dry transfer stars (Archer has both) etc.
Or, you can cut your own using Tamiya wide tape or something similar. Put the tape on a piece of glass or tile, lay out the stars and cut them out with a knife. Paint the doors white, apply the star mask, and then paint the tan.
These are for aircraft but would work on armor