I think the Annie would make a very nice representation of a standard gauge 4-6-0 in 1:29, but I think a few things should be changed in addition to the domes, headlight, smokestack and cab. The pilot should have most of that narrow gauge bulk taken off, as well as the over-sized smokebox support beams that connect to the pilot. See this photo posted at the NGDF; http://ngdiscussion.net/phorum/file.php?1,file=18394 the most noticeable attribute to this locomotive is the placement of the running boards, which are nearly in line with the centerline of the boiler. The replacement of some piping with smaller diameter piping would also help give the locomotive a more standard gauge look. This sounds like a very fun project! Good luck!