Looks great man! I built one very similar last weekend, but it's not complete yet. Mine's slightly different in shape and I used 1/2" mdf because I needed the mounting depth for my sub. It's a tough little spot to build a box for but it looks like you made a good job of it. Can't wait to see it finished.
How do you have yours mounted? I'm thinking of using a few small angle brackets to secure mine.
Here's how mine turned out.
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