Ed,
The one I have (a 3'x4' General CNC) is probably a more professional model than anything Craftsman would sell, but I don't think the concept of a 3-axis CNC router works well for smaller models than maybe half scale guns regardless. And of course, using wood as a medium limits the detail level quite a bit. You just have to look at it as "strictly decorative".
I haven't worked much with scans yet, got a laser scanner off of eBay a while back but haven't really made much of an effort using it. What kind of scanner did you use?
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