Large/New Advent crossover schematics

After searching out all the various posts here, I'm convinced that rebuilding the crossovers on my New Advents would gain a significant improvement. However, I've not been able to locate a complete schematic for the crossover - only partials. Does anyone here know where I might find one?

Conversely, if anyone knows of a crossover circuit that would be an improvement over the OEM one, I'd consider going that route. It would have to come pretty highly recommended, though, for me to second guess Mr. Kloss...

David