4 way + coaxial midrange/tweeter

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Hello,
I'm thinking of building 4way loudspeakers with coaxial SEAS MP14RE.
In theirs brochure SEAS recommends to use it with 2 mid/bass speakers, one above and one below this unit. For this speakers I have 2 options (because I have this speakers already):
1. VIFA M17WH 0908
2. SEAS CB17RCY/P
For bass, I'd like to use Peerless India SKP254/ I have them too.
My goal is not reference/high end sound quality, but proper interaction of loudspeakers and room; so I'd like to use this ideas:

1. coaxial tweeter/midrange (MP14RE), bipole design, crossover point about 2500Hz
2. symmetrical midbass units arrangement, bipole design, crossover point 250Hz
4. slim loudspeakers front and rear, about 180mm
5. deep clean bass - also bipole design (units mounted on both sides of loudspeaker; max. 6 units per loudspeaker), crossover point below 100Hz
I think of the same units placement on front and rear of loudspeaker.
What do you think about this design?
 
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