if I knew anything about entity programming, I maybe wouldn't tell you this but, well...
can you somehow find an entity which is located at the origin you specified? If so, you can just change its model to whatever you like... otherwise you'd maybe have to somehow destroy or hide the "old" entity and create a new one which uses your model.
Well as said I don't know too much bout entity stuff, but maybe it helps a lil
Greetz MGee
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