Carpet is easy... Lots of places sell similar automotice carpet on the roll I bought black automotive carpet for a box one time but you can gray and other colours as well... As for the box you can only get one if you bought a 2007 Hyundai Accent SR. I dont have any of the table saws etc I might either take it to my wife's uncles place to cut it or might take the pics to a shop and let them build me something similar.Looks better than what I got flying around my trunk when I take turns. Alot better. I got a sub box with 2 10" speakers. Very small, and light weight. I would much rather this. Dido to making one. Wish I could find the matching carpet though. Does anyone know where to buy one of these? Just curious.