We sketched it out a bit at the beginning.
A few days later, we sanded them down with the belt sander to make the glued edges smooth. We then marked which legs were which (right/left front, right/left back) and tapered them down on the table saw.
We measured out the 20"x48" piece of aspen and cut it into one 20"x30" piece and one 20"x18" piece.
Using a makeshift compass (see photo), we carefully cut out a 16 3/8" diameter circle in the center of the 20"x30" piece. We then cut out an 18" diameter circle from the 20"x18" piece.
That's the end of Part II. More coming soon.