I would be curious to see how long the parts express sealed enclosures hold up to the amount of force that would be applied with a 12W7 sealed, the DCX 2496, and 2K watts of power on tap.
Having had a lot of experience with the W7 drivers, I can tell you that a poorly constructed enclosure does not last long with them. (Not saying that the PE enclosures are of poor construction though. They are pretty well done for a pre-fab enclosure, but a bit expensive.)
I just sent my first DIY out the door to a very happy customer, with a TC-2000, and let me tell you, it is a monster comparing side by side with a JL Audio F112 which has a bit denser cabinet, and my sub with proper bracing went toe to toe in ever aspect.... the only thing lacking with the 15" TC driver compared to the F112 was the upper bass handling. the F112 was just better in that dept, but with proper EQ will match it with no problems in that aspect.
I was truly blown away with the performance of the TC-2000. The only difference with that and the TC-3000 would be the 3000 would have the ability to work just as well if not better in a smaller box, even though the 2000 performs amazing in a 3-3.5 cu ft box... powered by a EP2500, will absolutely pound...
Using 3/4" Baltic Birch 13 PLY with enough bracing will provide you with the most incredible tight and accurate bass.... I might just have to get a JLw7 to try it out in my own enclosure sometime and put it up against the TC drivers.
I agree 100% with annunaki....
I don't think I would trust the JL drivers in a prefab enclosure, the power of that driver will likely cause havoc with an under built enclosure, unless its under powered.