I love what you've done to your trunk. The first time I saw that pic It gave me some ideas. I'd like to do my trunk the same way, but I already have a box for my speakers and have decided to keep it, so I went ahead and try to build a wall like yours with the cd holder in it. Right now it has my cd holder to the left bottom and my amp mounted on the other side. Because of the hump in the trunk the board that is carpeted is not secure. It is basically forced in to place.And it's not over the hump where I would like it to be, it has to come out and be re-cut so it sits on top of the hump. I see from your pictures that it looks like you built up to the hump.I would like to mount both my amps once the other gets here along with the cd changer. The cd changer is screwed to the floor on the hump and I just cut a hole in the board so it's accessible(spelling). Would it possible if you could give me your measurements on the back wall. Me and my Dad have been trying to come up with different ways to mount the board. But the best way seems to just force it in between the trunk bars.