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I'm going to play devil's advocate here for a moment, from my understanding, the OP has a prop that did not originate on this website, hence it is not stepping on another member's work, it is stepping on the work of someone who has no presence here. That would seem to throw a wrinkle into it, wouldn't it?
Indeed, to be clearer, a "member" in the universal sense, as a member of ANY forum or board dedicated to reproductions. I revised myself in the next post as distinguishing between ORIGINAL or REPLICA. (1) An original as anything produced as a prop in a movie, tv show, or commercial toy. (the last debatable) that is made by a large company who has their own lawyers to protect their IP rights.
A replica would be any duplication of item (1) done by an individual or small company that cannot pursue legal action because they don't own the legal IP rights to the product. Recasting is not really a legal term in this sense, it is an idea that is perpetuated by responsible forums and boards to provide protection for it's users.
Ultimately, if you want to recast anything, simply ask, "Is the thing I'm recasting an original prop, or is it a Replica?"
If it's an original Prop, then fine.
If it's already a Replica, then it is NOT fine.
This one question should let you decide whether what you are doing is right or not.
******And yes, everything said here applies to SELLING of the mentioned item. Making it for yourself by recasting is acceptable if you don't sell it.********