Thanks Dave.
I wouldn't have done it without your input, and it was well worth the effort. All the naysayers that never tried it and said it wasn't worth it....well it's gonna sound like a regular door panel with 1000 watts in it! And I've not seen a pair of 6s that can take that kinda juice.

 

Still not sure what amp to use for the tweets. Was going to use the FPS-402. 40 per ch at 4 ohms. Maybe a 4 ch amp would be better, kinda worried that running the 2 ch into 2 ohms with the tweets paralleled mightnot be quite as clean.
A 4 ch would allow a bit more independant gain control from the 2 sets as they're going to be probably mounted in different locations.
Guess I can try it out, as all the wires will be there and it won't affect the install ...lots of room to go with a wider amp, and won't see the ends anyways under the window.

 

this car is going to pound ive seen it its amazing