I have ordered a couple small window kits from a local retailer. I am going to install them into my case. My question is about the cutting of the holes. The design is sort of a swoosh design, take a circle squash it then move most of the interior to one end. I have a dremel but there must be more efficient way to cut this out. I am thinking of a hacksaw blade and wrapping some tape around one end and using it like a jigsaw. Would this work?

My case is aluminum so a metal hacksaw blade should go through it pretty easy.