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Reverse Engineering woes

Hello all,

Have a casted part that i can't post a picture of, it is part of some kind of machine table, has a ton of features on it holes, slots, steps, partial radii and more things on the bottom side. My question is : is there a method as to how you go about measuring this thing out so as not to miss some thing? So many different things to measure.....

Thanks for your input.