Here's the progress on the base. I modeled in Solidworks since I was making very slow progress in Maya. After I switched it was a pretty straightforward process.
First I made the base. The arm will go into the slot and the bolts will go through the holes (which are countersunk for aesthetic reasons) in the base as well as in the arms. It should hold. What do you expect? Am I some kind of engineer or something?
Next I got some bolt and nut files from McMaster Carr and assembled (Solidworks lingo) the parts. I should mention that everything is to scale and I'll be using a nice oak board that I found to make this thing.