Kevin, I was looking at those arms and saw that they seem to be of some sort of a tapered piece curling inward. So, I think if you have some forstner bits you could do some concentric circles moving inward and reducing the sizes and it would appear that they were "swirling". I was thinking of how to make the tapered effect also. It's going to be a real head scratcher though. If you do make one, it might almost be a good idea to make extra pieces and parts as you go along so that if you screw up something you have a fall-back on hand. As for all the different types of woods, the one pictured seems to just be painted. That's how I might go about it too and just make it out of whatever you have on hand.