building box in my cobra

Hey guys I have a 12" MTX 9500 that I would just love to fit into my trunk. Ive seen a few box designs i like such as something that lays against the hatch and looks like a wall so you dont get the whole, "I just threw a box in the trunk effect". The thing is my factory amp rack is in the way so I have to do some wierd things to make it work. Can anyone offer me any suggestions, ideas, or hints? I am going to delete out my backseat and float my JL 450/4 and JBL 1200.1 on the backseat wall. Thanks for reading!

2003 ford mustang cobra.

Here is a pic of the trunk. Like i said, it would be nice to have the one 9500 in the middle and to the left and right of it just a straight piece of carpeted wood to reach out the the other ends of the trunk to make it look cleaner.

I'd much rather just throw a 9500 in the trunk though. I actually work at electronics retailer and happen to work in the car audio secion. We just dont really do custom work like this. I suppose i could ask one of the installers that used to do custom work. It's going to suck building that box inside the trunk. But i guess i gotta do it...