Complete stereo install questions?
 

Planning to install a bunch of components to system and would appreciate any advice/comments:

First of all I will list what I have installed already:

Sony Explod HU CDX-GT510
MB Quart Tweeters in Dash
Pioneer 6.5's in front
Pioneer 6x9s in rear

Now what I want to install: (98 Accord V6 EX)

5 Gauge wiring kit
Phoenix Gold XS 2200 2 channel amp:
SDAT 12"500 max watts dual4 ohmsubwoofer invented custom box
Soundstream Rubicon 404 4 channel amp w/ Hawkins Bass Control and many crossover dials
Coustic XM-33 Way Electronic Crossover

Questions:

1. My MB Quart tweeters are in my dash and I don't want to move them if I don't have to...so what would be the best way to hook these up?
I do not have a passive crossover for between my mids andtweeters only bass blockers...is this a bad way to go? Would wiring to the tweeters require the dash to be removed...difficult?
2. Should I utilize both of these amps?
3.Should the Coustic crossover beused?for both amps, 1 amp (PG XS2200), or not at all
4. As my sub is dual coil at 4ohm and the Phoenix Gold 2 channelamp is 2 ohm stable, can I wire this to the sub to make it 2ohms?

Thanks for any help/suggestions.