Photos would be a huge help. I did check out the post randy_tho had and his set up was really clean but I'm not really going that route so I'm still kinda stuck and I don't think the base model has stock amps for sound. Running everything off of stock until I find the right head unit amp and sub...
For my set up I'm pretty much doing the same as birkination. I purchased the Hertz DSK 165.3 components for the front and they have a passive crossover which is about 3" x 2" x 1". Just not sure of the best place to tap into. I plant to upgrade the head unit with amp an sub down the line.
Did you ever figure this out?
I'm stuck trying to install a set of component speaker as well to the factory wiring but have not figured the best place for the crossover and splicing.