My brother has made significant progress on his cabinet, so I thought it deserved a pictorial update. His next step will be installing the keyboard tray and applying the side art.
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This is taken from the inside of the cabinet. He used small L-brackets like this to secure the bezel from the inside (3 of them, one in the center at the top as shown, and 1 on either side near the top). This differed from my approach as I used thin pieces of wood painted black along the sides. Either way works fine, I just think my way eliminated the gap between the bezel and the cabinet so no light would shine through.
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Here's the marquee installed. Great artwork on this cabinet.
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Here's the bezel installed.
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Here's the marquee with the light on.
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And finally, the whole cabinet. Coming along!