Been working on a C-21 drawing, 1/2" = 1', for several years. Last worked on it in September 2012. Lot of other irons in my narrow gauge fire like my K-36 zen 3D model and some Sn3 stuff (like assembling the incomplete bag o' C-21 parts PBL found for me), will get back to the C-21 drawing sometime soon I hope. Search this forum and you'll find references to more C-21 resources, for instance:
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ngdiscussion.net]
Lots of appreciated contributions from the members here regarding the C-21s and some of their close cousins.
My drawing, such as it is, is posted on the Yahoo C-21 live steam group:
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groups.yahoo.com]
Not sure if you have to join to view. There you'll find some other nice drawings as well from other members of that group.
Hope this helps.
Mike McKenzie
Frankfort IL