I just happened upon this:
http://www.cascadeaudio.com/pdf/Indi...P_MC_75192.pdf

Has anyone seen or heard these?

 

Sounds like door mounted kick panel type pods to me, any good speaker install place would be able to make some for you. I was thinking about doing this myself, the stock mounting depth leaves a lot to be desired, and the floor isn't really big enough to put kicks in down there, especially with the clutch in the way.