As for that left handed saw, set the blade to minimum depth and it will cut a nice curve. Dust collection port picks up almost everything. The left handed blade makes it easy to see the cut line, but be careful, there is not much saw between the blade and body parts. I moved it wrong once and it backed up on me, I should have had the work piece secured better and been standing back a bit. The blade sucked the tail of my work shirt into it before I released the trigger and nicked my pants, too close to the femoral artery. I was not cut but got an important learning lesson.
While "touring" eBay sales, this little left-hander seems better suited for the plywood you're using: