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Yeah your right, there would be no way to use a hole saw without the guide bit helping...
I like it the way it is. You could make a bigger bowl. Also, when you make the bowl, I'd cut the small hole first then the bigger one. That way you don't have to hold a round thing in your vise ( less secure) also, you wouldn't have to reposition the vise jaws, making it faster. But other than that I really like it.
Too bad it doesn't work on starlings..... If you don't think this is nice, google "starling flock" and look at the images. Now you know what I mean? But really, this is a really cool idea for a feeder for any birds as long as it DOESN"T work.
A Chair for the Great Outdoors