The Civia Hyland frame is available with Rohloff compatible sliding dropouts. Also derailleur or Alfine compatible dropouts are offered, all bolt on.

Alternate Needs Transportation in Massachusetts does Rohloff compatible frames too. See below.

http://www.antbikemike.com/rohloff.html

Per the Rohloff hub manual only frames with ISO rear disc brake mounts can use the speedbone and OEM2 torque arm. This does not include bikes with the brake caliper mounted inside the rear triangle. Civia gets around this by using the OEM torque arm and having the brake caliper post mounts on the sliding dropout. A different engineering approach to the mounting requirements.

The Steel Wool Tweed does look like it has definite possibilities as a Rohloff hub platform. I need to take another look at it.

The Surly Big Dummy has vertical dropouts w/o an eccentric bottom bracket so needs a chain tensioner. Surly's Karate Monkey has been used as has their Crosscheck. The latter needs the long torque arm.

Unless you go with a true custom frame the frame options available for a clean mounting of the Rohloff are limited in the U.S. unfortunately.