Getting the Wheel Pieces Cut

I've started cutting the pieces that will eventually make up wheel. I'm making my wheel from eight pieces of oak cut at 22 1/2 degrees. The plan calls for a wheel made of six sections, or planks as they are called in the plans, but I don't have a wide enough piece of wood for the hexagon size pieces.

I need to decide how I want to join the sections together - either splines or dowels. My plan is to drill the holes for the spokes in each section before I join them, then join the pieces into two halves. I can then mark out the inside circle on them and temporarily join the halves around the band saw blade and cut the inside circle. Since I've never done this before and can find very little information on the subject I'm playing this by ear - so to speak. I'll let you know how this all works out.