The cleaver is here and the blade side is 6 5/8" exactly. Hope this helps someone good with numbers scale the Kill Knife.
Using that metric, and without normalizing my results, I got that the blade length is 6.6311"...less than 1/50" different from my previous multiple-scaled, normalized results, which gave me 6.65".
...that's less than a .3% variation. I'm confident sticking with my numbers that state that the overall length is 13.207" and the blade is 6.65".
-Nick.