Looks fantastic mate, really well done. Just curious as everyone here seems pretty on the ball with the finer points of audio engineering. Is there a maximum size of a solid grille I can put on a sub that won't hinder the quality? I notice you use mesh but I am hoping to have a piece of cut stainless steel in the shape of a logo and mount across the sub as a grille. Sorry for high jacking the thread a tad. Shame there aren't many good sound off's here in Oz.
You should have at least 50% open really, the more the better.