Also plan ahead for either getting a few friends to help lift and support (supporting the entire length) of the mirror while the hanging process takes place (better would be to rent a drywall lift.)
If you do go the rabbet approach, I would either recommend that you set the rabbets way back in the stock if you use oak as that species has an open grain configuration and is not as strong in such applications (for supporting lots of weight with minimal stock ) 1x is OK but 5/4 is better OR choose a tight grain hardwood species for the frame (maple, cherry, poplar are decent choices.)
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