Here this crossfire has what you are trying to do. It shows the two subs but not the underneath part where the box is in the emergancy well. Hope this kinda helps.
2004 Chrysler Crossfire Coupe, White, auto 19K Many Extras! Must See!

On a side note what does the front and the back side of the wall behind the seats look like with out carpet or plastic on it? Any one have pictures? I might get one once I sell my Solstice, but want to know if would be a difficult project to put subs on the back side and component speakers in the front side. Still need to go drive one though to make sure I want to give up my Solstice.