Very cool! Having made tool holders for these smaller posts, I know they're a lot of work. Will your post take commercially available tool holders? Sure would save some time if it did.
I use a post from TS Engineering that was the only one of its kind on the market. Instead of pushing the tool holder out when tightening, it drew it in. The idea, I suppose, was to make the tool holder and the body of the post into a solid mass. It worked, too. Too bad they went out of business.