I was wondering whether anyone has done a Rohloff brazeon on the downtube (maybe at a horizontal right angle to the bar), or anywhere else for that matter?

What is the diametre of the tube required and the length of tubing necessary? I believe it is a 1" or 25.4mm diametre tube - for MTBs.

As I like round lugs on brake bridges and seatstay bridges are there any for the tubing in question or is filet brazing the only polished answer? Any pictures?

The alternatives look a bit ugly.

Is the German handlebar the NÖLL thingy (translates from German to English as: racing wheel)?

Is cabling the issue? Can it be done internally, or is this too bent up for the cabling?

Steve