The first thing we had to do was measure out the cuts for the rounded corners. Massey came up with a pretty good mechanism for marking out the curved line. I am sure that they sell such a device but hey, we only need it once.
Once the lines were marked, I took to it with a jigsaw. It wasn't as hard as I thought, but the blade wanted to curve out as I tried to make it turn. No problem as Massey just sanded it down smooth.
So the corners for the base are cut, as the walls. We are moving along just great.