Active would really nice, but the price of extra amplifier channels really dampens the value. I posed this very subjective question in the V1 review - is it worth it to go active? The consensus in that thread seemed to be the combo of passive+active was a better value.Me thinks this project would really shine as an active design.
Eleven filters seems like a lot of eq after the passive corrections for a two way.
One thing I saw being done with a different diy speaker was to implement the barest bones for passive crossover with the rest of the signal shaping done via dsp. This minimizes crossover parts cost and still allows for a single amp channel per speaker. Seems pretty complicated for a novice to figure out on their own, though.