I have to weigh in on this (pardon the pun)…..
…most criticizing Rohloff or internal gearing in general have never seen one, much less ridden one. And few have done their homework re: the weight differential issue. I did that homework long ago when I saw the first significant article on the Rohloff in MBA (1998). Conceptually internal gearing blows the doors off the externally geared drivetrains. The main issues: cost, weight disadvantage, increased "sprung" weight. Weight is really a non-issue. Compared to a typical DH or freeride setup, the differential is 250g (you have to compare the weight of everything you are replacing not just a derailleur vs the hub). This really is a minor increase in weight for almost all of us (and I ride up more than anyone I know). Cost; okay this is a real factor. These things are pricey but if you look in terms of portability from bike to bike and the fact that they last, seemingly forever….forget about it. The sprung weight issue has some merit, particular on some suspension designs but on most this is overcome with appropriately tuned shock and spring rate. I have run them on single pivot (not that good) and vpp (excellent and a complete non-issue).
The advantages: almost no maintenance, optimal chain line at all times, instantaneous shifting while pedaling or not, exceedingly long service life, almost indestructible, gives a big bike a complete range of gearing covered by a typical 27 speed xc bike with no duplication of gearing that is all completely evenly spaced. The main disadvantage for me is that I will continually forget to oil my chain as there is really no need to ever look at it.
Regarding the Hammerschmidt, I can't see pairng it with the Rohloff as the range of gearing on the Rohloff already covers way more than anyone would have on a 2x9 which would give a high gear that only the Terminator could push (though that would be cool to see). None the less, I really love the idea and the ingenuity of this and the undeniable bling factor. Mind you, I'm like a Crow and shiny things when it comes to bike parts.