I also found some interesting stuff on this website after searching far and wide.
http://www.toyotanation.com/forum/t114109.html
I know, I know... I should have looked there first, but it was hard to find. Others may find the PDF files and diagrams helpful if considering this as well. And yes, keeping the stock look is the goal so the car doesn't look like theif bait. I live in the DC area and my Isuzu Amigo got broken into for the stereo. So as much as I think the speakers look cool, they're staying hidden in the Camry. (I'm keeping the stock stereo despite a sincere desire to upgrade it as well.)