I'll be interested to know how it all works out. My RP-440WC is due to arrive today. Where did you purchase the crossover? Would you be able to PM me the schematics?
How do you know the drivers and tweeters are different than the RP-440C? I figured you could either purchase the RP-440C crossover network and wire it in or if the schematics can be found, the crossover could be made.