I am planning on building a "Home-made" SVS with an Shiva Mk III and a 250 Watt amp from parts express. I'd buy the SVS, but im short on cash, and what ill spend making this sub is still streching my small budget. I've been readin up here these past few days and still wonder what an SVS looks like inside. Are all the ports the same lenght? How much polyfill(if any) does it have? If anyone has taken apart their SVS and would like to share their findings I would be most grateful. Pictures would be awesome. Thanks in advance. Deepak Jr.