Follow up since i actually got to meet Ray
You need help with the stereo stuff lemme know, I actually know how to do that :P
As for speakers, safe bet without modifying is under the seat, kickpanels for existing spots which I'm not a fan of cause I keep kicking them... or if you wanna get super creative you there are places under the actual dash vents by the windshield that you can squeeze some high fidelity small speakers into (big isn't always better, see BOSE) and get good sound.