Is it in any way possible to put some 6.5" speakers in the kick panels of a W124 coupe? If not, what's the least intrusive way to mount some 6.5" midbass speakers in the front of a W124 coupe?

What I'm looking to do is install 6.5" midbass somewhere in front, keep my Rainbows in the dash, and subwoofer in the back. Ideally I'll use an electronic crossover and 5 amp channels to power it all.

Suggestions? Anything? I need inspiration for my system design..

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Jay
1998 S320