Well, I had to do the brackets out of plastic, so I was unable to fit all the proper pieces in and curve the actual mounting surfaces outward and still have any space at all between them, so I used separate tabs and placed them inboard. I'm happy enough with it, and it certainly looks better than what Tamiya gave me.
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Details on the "feedback" thread. Thanks to all who helped, it was a perfect example of all that's good with modeling forums.
Edit: Upon consideration, I'm anal enough I may try and place the tabs outboard of the brackets.... have to think about it.