Can you help me with a design?

[rwussow 0]

I have a 2002 Nissan Sentra and was wondering if anyone would be able to share a box design that they have in there Nissan Sentra for one 15" BTL? Room is not a problem because I don't use the trunk for anything but for my audio system. If anyone has any ideas that would be great. Thank you. You can see my setup I have for now at http://www.carstereo.com/rwussow. Later.