Interesting concept, but I have got to ask...
Why in the WORLD would you use such a large case if you're trimming back to 1.800"?? You've essentially duplicated the 35X460 wildcat, but added a belt, greatly increased case prep and spent a premium to buy brass that you're then cutting in half. The irony is you aren't gaining much at all over a 358WSM - 1.8" or the aforementioned necked down 460S&W.
I'm all for new wildcats but that one has me scratching my head. If anything, a 458 American, trimmed .200", would have made a whole heckuvalot more sense.