Here is the how to:
At least, how I did it:
1. Empty trunk (duh)
2. Frame out the trunk with a support brace across the frontback, and middle where the door for the spare tire is. i ran my main braces from the front to back right to each side of the spare tire well, you'll see little spots where they fit perfect
3. Like suggested trace out cheap carpeted thing onto plywood or mdf board(i used mdf board)and cut it out
4. next you need to make your 4 pieces out of that one piece - you need right side, left side, front, and hatchdoor
*be careful to measure so that they all match up to the bracing you jsut made for the floor to sit on
5. after you get the front, and two sides in there, carpet them
6. trim middle piece to allow room for carpet, and if you are going to put handles from the underside to pull it up as i will, allow for those as well, and you're done
also, my rca wires all run from the deck on the right hand side of the trunk, the power wire runs from main battery to the trunk on the left, the ground cable going from the battery to tha amps are about 6 feet long, and the actual ground for the battery is only 1.5 feet, thats the most important one
i dont get any kind of noise whatsoever from this setup(second time i have done it)
