Just took the weights off my base this morning and it came out very well -- all square, nice even rabbet all the way around, sharp edges, and all-in-all the way it's supposed to. I wasn't quite so luck with my s.e.x. base, but as I'm about to build a slightly larger version of the s.e.x. with a new top plate and base, it's not a big deal.
Now that I can "see" it in it's full form, I don't think it has nearly much of a shoe-box look as I was suspecting, and a little round-over on the top and bottom edges should give it a nice proportioned look overall.
-- Jim