how to best use all this stuff in my van

I've got a pretty great Mitsubishi L300 van I'm looking to put a system in so I can blast it on summer roadtrips. I could really use some help making sense of how to best make the best-sounding system out of some stuff I've got: I've got:

Kenwood KDC-135 head unit
Crossfire TEK 35.2 two channel amp
Pair Boston Acoustics 5x7 3-way speakers I can put in rear
Pair MB Quart 6.5" DWE 160 SP midbass component speakers I can cut out for to put in front doors
Pair MB Quart DTE 19 SP loose/unmounted tweeters to put somewhere
Pair Pioneer 4" speakers that fit OEM spot in dash
*considering small JBL CS-BB2 powered subwoofer rattlebox for front van floor under dash?

The HU has wired output for (4) speakers plus a pair of RCA jacks for "rear" or "sub". The TEK amp has one bridged set of outputs. It's more important that it sound good up front, where I am. What would you make use of, and how would you run it? Appreciate your thoughts! LB in Portland

My instinct is to put the 5x7's in the back leave the 4" in the front dash and run them both off the standard speaker wires from the HU. Then put the 6.5" in the front doors and run it off the TEK amp which would receive input from the RCA outs on the HU. Forget about the tweeters and the rattlebox sub. Whatcha think of that?