Oh absolutely no hurry whatsoever... I don't have the wood yet, nor can I afford it, as I'm saving for gas/entry fees for the Kelowna show next weekend. It's gonna be a month before I get to build this box I think...
But don't worry, I'll bring the APX to show off at the show. Maybe we'll hook it up to the amps just sitting on the floor in the back for a thrill...

You makin' the trek to Kelowna?
Oh that reminds me. I use two Orion 1200d's for my sub right now. So for it's break-in period, I'll try it hooked up to the bridged amps at 1.4 (series two coils together to get 2.8, then parallel the two sets together to get 1.4 final). That should give it roughly 2000 watts. Then a few days later I'll hook 'em up at .7 final (unbridge the amps and give each amp two coils parallel), which should be good for 2700 or so... 3000 with my locomotive battery setup for competition. And then I'll decide which I like better for daily driving, 1.4, or .7. Most likely the former, as my 140 amp alternator works it's ass off at 1 ohm as it is...
But eventually, I hope to double up on power (either with 2 more 1200d's or trade'm in for bigger stuff). So the box should be designed for up to 6000 watts I guess. And SQL with the plug in is far more important to me than SPL with the plug out. It'll be loud, no matter how ya cut it. Makin' it sound good while slamming at the same time, is what I love about my 12" H2. I hope to get this APX to be about the same...
And yes, I want it to WANG, and still sound as good as it can, being an SPL oriented driver in the first place. My comp box for my H2 is way louder than my daily box, even with it's port plug in. I'm still not happy with my daily H2 box and need to shave another 1/4 inch off each aeroport. But I love that comp box... ~33hz with the plug in, and just loud enough to rattle your vision. 50hz with plug removed and running a 50hz tone, 146.6dB on the windshield is my best score.
And I have no idea what the resonant freq. of my van is...