Actually, you've beat me to the punch! I was thinking about carbro/tri-color-carbon, but I'm not honestly considering that at the moment whatsoever. (still cutting my teeth on black & white)
Really I'm just interested in seeing the designs and reading about them. Were there any that didn't use filters, but instead reflectors? I'm reading Friedman's 'History of Color Photography' and he says there are mirrors that will selectively reflect only certain colors (primaries) with 90% efficiency. With this in mind, I'm surprised they used filters at all. But who knows how practical/affordable this other system would have been.
Jeff, do you do your own color carbro? I'd really like to know more about it and its modern day feasibility. Shoot me a PM if you're interested.