[Gogar]

It's going to be a challenge to even find space for separates in the back!

One suggestion:

If you're not going to have the stuff "on display", as they say, you might want to find a way to mount the crossovers closer to the speakers.

That way you'll only run 4 speaker wires all over the car instead of 8.

It's nice to make a cool-looking mounted setup with the amp/ crossovers etc. but if you're just shoving it under the seat it doesn't really matter anymore.

I mounted my crossovers in my Targa in the front trunk and then I had to try to feed two speaker wires through each door jamb etc. and now i wish I had wrapped them up in some cellophane and snugged them in the bottom of each door. I don't need to see them or access them.