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How do you get your burns so deep? I have seen this done on lots of other work but never so deep/wide. Is it the transformer you are using or is it the wood?
I went with mitered corners and put in some splines for added strength and aesthetics. I used lacewood for the box, the back and circle plugs are black walnut and the splines are Peruvian black walnut (nogal) which is a bit darker then regular walnut. I did a bone headed thing and cut the coin hole in the side instead of the top- so I just went with it and did the same on the other side and put the plugs in. The back is recessed into a groove- added support and made glue up easier.