A couple questions:
1. how are you coming up with the shape of your boxes? Are you keeping track of your port dimensions? The two side boxes seem to be different in the port areas. If that's not done correctly, your sound will suffer.
2. Why so many screws? Believe it or not, but wood glue is better for boxes. Screws can vibe loose, wood glue tends to stay.
3. Are there any reasons why you want to have them fire differently? One is front-firing while the other two are rear firing (If I'm imagining the placement correctly). I find in the trunk, rear-firing produces more output but my ports are on the same baffle as the sub. So your most powerful sub isn't in its most efficient placement (though with three subs it may not matter).
4. How's it all wired?
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