The Type R setup was a prefab box that I added a 3/4" strip of wood wrapped in matching carpet to the bottom to seal it up. Also screwed side filler panels to the sides of the box before putting it in the trunk. (see pic) The particle board in the trunk on the type R setup was just for template purposes but is the only pic I had of that setup. I screwed a 2x4 cut as wide as the trunk to the back of the box, one across the top and one across the bottom. Once the final panels where cut and carpeted that setup worked great as you could hide the wires AND left lots of trunk. I believe that box was around 2-2.5 cu ft. The FI setup enclosure is huge and had to be build partly in the trunk as the box wasnt going in fully assembled. Both setups work great in regards to being able to brace the rear deck against the top of the box. As those are usually flopping like fish in an Accord. lol Cheapest sound deadening I ever did. I would hit up Alton (a member on here) and see if he will design you an enclosure to fit your trunk.