Nothing wrong with the old 'tried and true' tracing paper method, i've been using that method (and white cardboard/posterboard) for the stencils for nearly 20 yrs now.. i'll be doing a cab respray thread shortly for a Gtb Genie i'm repainting for a fellow AP member  

Your playfield looks like it'll clean up nicely, looks like it'd be a interesting and fun player
looking forward to seeing how it turns out