I was just mucking about on the net looking for a good sub cabinet (okay just the plans really) and I came across this monster : http://www.acoustic-visions.com/~acoustic/products/subwoofers/pre_finished/pinnacle_everest.shtml. Pretty snazzy and only a skosh over 400lbs. I know that it isn't a DIY sub but there was a bunch of neat kits and I was perusing the site when I came accross this guy. Let me know what you guys think.