Louie, I havent used the locking miter bit at all. My thought on this is that joint would look funny on the top of your case. Have you considered using a finger or box joint?
I have attached a corner photo of one of my cases. Please excuse me this form style is new to me.BobandRick said:Can you show us your display cases, with a detail shot on the miter joint...not sure the lock miter is for this job but maybe?