Canuck: I had to cut a tiny bit of metal behind that panel on the doors. There is a square depression/opening behind the panel where I've placed my speakers, and you need to widen it a tiny bit for the speaker basket to fit. Two of my screws are securely attached to metal, the other two are secured using the clips that were supplied with the speakers. I also made a baffle behind the speakers on top of the magnet to prevent water from dripping into the voice coil and causing corrosion. If you look closely at the pic, you will see that you also have to cut a small section of the map pocket closest to the speaker to make it fit.
As for the component speaker idea...high-frequency sound is very directional, as opposed to low frequency which is more diffuse. Consequently, I would think that you would want your tweeters to be firing towards you in order to fully enjoy the sound. If I had components I would still mount the tweeters higher up on the door panels. My 2-way coaxial speakers sound fairly decent for a relatively inexpensive sound system.
MikeyT: Thanks for the tip on better speakers...I'll definitely do that for the CB.
Cheers.