My advice? Do more than one gallon!
Don't be afraid of the rauchmalt (although 50/50 is fine; some people are chicken**** when it comes to smoked malts and won't use more than 10%). Technically, it's supposed to be a lager but you should be OK with US-05 (it's clean enough). VERY modest hopping; bittering additions only, nothing even close to the end of boil. I'd probably bitter it to around a bock level (maybe 20-25 IBUs), depending on the original gravity. If you want a little closer to the smoked-bock flavor, I really like using some Munich malt in there as well; Munich and Rauch play well together, IMO.