ha ha, i haven't gone out painting in a long time. But you don't have to make it just one big stencil, you can make it in segments. Like break the image into 4ths or 6ths and just do one part on each square, then just line them up when you spray, that's how stencil artists that do huge stencils do it.
and if you want something decently big and durable, mynamewontfitin suggested to me getting newspaper and coating one side in packing tape then drawing on the newspaper side. you could always give thqt q try
