I think Wayne used to include the CH3 in the Theater 4 kits - I remember voting on whether we wanted the CH3 or H290 so he could standardize.
The crossover is stock Pi/Eminence with the 10db pad and comp circuit. I'd have to look at the parts, but the HF section is probably right out of the Crossover Document for the PSD2002.
6 of them will be a good project! The full-size version is kinda big to put on stands, though - how are you going to get them up high enough to reach out over the crowd? On second thought, 6 of them in a room should reach everything just fine.