I believe that AC3D works in "units" (Andy or Jeff - help me out here) and it does default to some basic Metric unit. There are several threads on measurements on the forum (I'm slammed at work right now or I would supply links). So read back on the forum threads and see what you can find. The engineers here don't understand how I can do some of this so fast and I explain -"nothing has to fit and nothing has to work, it just has to look right".
Have Fun
Art
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