You are a VERY lucky person, that loudspeaker configuration is one of the best possible ever produced. Please take your time sourcing and configuring parts and pay serious attention to your wiring harness, I can assist you there (ask me how I know) the wait WILL be worth the patience. Mr Ritchie was on the cusp of world class products, IP technology transfer issues precluded those efforts, superior products would have resulted. Please post more descriptions and pictures as your build progresses. I'll bring the popcorn.
Be well.
I am really glad you reached out. This has involved planes, trains, and automobiles... literally!

When you take the next step, you can sometimes make your own luck... and in fact, that can happen with special wire too.
I am going to do my best with these... while trying to remain somewhat $ane.
I am glad to have made some friends at Shunyata Research, who have been all too happy to help.
I am also working on that large value in the woofer network. The crossovers will be BIG and external... We will see which "Large Cap Stocks" are available to invest in.
I am focusing on how to flow CURRENT to 82 drivers... Fortunately, I have a pair of Pass Labs XA200.5 monoblock amps (among other things).
I am going to experience 200 watts of pure Class A driving these, along with the new First Watt SIT-5 amps (my favorite)... and I hope many others can experience it as well.
I'd like to think they will have the best of the best. I will share more for sure but it will take some time to write it up.
Thanks again for reaching out and I will surely appreciate your help.

