Advise Needed

Hello everyone,

I am wanting to upgrade the audio in my 2015 Prius C One, and need some advice. The most I have done in the past with any car is just replace some door speakers, so I am trying to wrap my mind around what this will involve. I plan on keeping the stock head unit to keep things simple, and there doesn't seem to be any aftermarket dash kits anyway. I have ordered an adapter already to get the rear output from the stereo, so hopefully that will work. I want to wire up an Alpine KTP-445U amplifier, and from what I can tell the easiest thing would be to run it to the 12V battery under the rear seat and add an inline 15 amp fuse. Does the stock stereo in this model have the "Power Antenna / Factory Amplifier Remote Turn On" wire coming out the back that I can tap into? I am going to get a component set for the front, and replace the stock tweeters. I think I can manage with the actual speaker installation, but am clueless how to take the door panels off. Anyone have any pics? Anyone have any suggestions or think this plan won't work?