with acustom box, your mounting dept is almost unlimited. like i said, plans can be made by me if you would like, but id rather see u get it formed to match your panels, if thats not a necessary deal for you, id be glad to help.
proboxrocks.com does make a great box for the camaro, you could at least use a prefab for the bottom, and build your own face, if you still want a custom look/mounting depth.
Well, i figured out that maybe just a round port would work much better. The only problem is the depth. In my camaro i measured out that 11" was about as deep as i could go, as if the sub was facing up. Well this would be the side where i would mount the sub, which alone is 12. Do any of you guys who have boxes in camaro's have a mounting depth of 14 or more? Because 14 is about the smallest i could make and still fit the sub in there. I can go around 26wide and 22 tall but the depth is what was concerning me.