If you rent a saw, it might be a good idea to practice following a curved line some before cutting the baffles. Goggles and good lighting are a must, a means to secure the workpiece from moving also helps, clamp it down. Buy a quality fine tooth, hollow ground blade, but not the real narrow scroll kind, they can flex sideways while cutting.

Start watching the sale ads, memorial day is right around the corner...maybe a jigsaw "purchase" rather than "rental" would be cheaper in the long run.

Convince the wife you needed it for "artistic self-expression" by cutting out a random scrap of wood, stapling her picture to it (with your new stapler!), and varnishing over it. Hang her on the workshop wall. Works as good as jewelry once in a while. Then on fathers day, she will be more likely to buy you that finishing sander you will be needing... Sam