I have also wondered about what's inside the hollow arms, and what may be hidden there?
From a few images you can see the end of a bolt with a nut on it?
Since the starter contacts the starter ring there, perhaps there is a castingthat helps to assure alignment and proper contact?
As I had been hoping to cast all this, (originally), I was hoping to figure out this mystery. It would require a special core to be captured by the larger mold, and then to be destroyed in the clean out? -or possibly this area could still be machined from the "sump" area when flipped over and worked upside down?
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