Done it, got the T-shirt and the novelty has worn off. I'm never going to use even a 1/5 of it's potential in the next few years with a little one running around so here it is for sale.
It's big, it's ugly but you won't beat it's output with anything less than a couple thousand in commercial sub offerings and your going to have to spend considerable more even DIY using conventional sealed or ported subs.
It's finished in black Duratex(not that great of a job) but can be redone. I'll include the Emotiva BPA-1 amplifier as well.
Local sale only unless you come pick it up.
$500
FYI- I got a quote from a builder and just the sub/enclosure (no amp) was $1200. It's not the best work but it doesn't have any leaks and performs in line with what I've seen from others that have built it.
Link to build is in my sig.