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Kind of. More a slight variation on it. Instead of two strips into the joint, just one large one at the top that slides into the slot above the main piece. The nature of the build means he doesn't need to worry about his panels coming out unless they slide up.
If you wanted to reduce waste as make this a one material project (finishing products aside) Instead of the 3D printed plugs make some trapezoid wedges out out some of the scraps,. If you make them the right size you could use a mallet to tap them in so they are nice and tight, but can always tap them out if you ever needed to disassemble the whole thing. Its an old joinery method but it works. I do like the 3D printed parts for the record.
Oh I read why you went with 3D Printing. I'm not saying suggestion would be better, I just wanted to add the suggestion for anyone considering your design in the future.
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You said you added an amp. what did you use?
Between steps 4 and 5 you might want to put a step about adding the bottom.
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By "source" I mean where did you buy it.
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