First will recommend Brewing Classic Styles. Definitely not "traditional" but tried a clone of Great Lakes Brewing Dortmunder Gold several years ago. Here is what I came up: http://byo.com/stories/issue/item/2920-dort-the-export Was definitely a crowd pleaser. Boost sulfate levels
I tried BCS and I underpitched. I had to finish it up with some US 05. It came out good. I'd try to mash longer and at a low temp next time to help dry it out, but I think you've got a lot of German lagers that all kind of blend together here and I wouldn't mind drinking any one of them.