I have a person asking me to convert her cabinet doors to glass. I see where this can be done and usually part of the instructions is to look at the end where the tongue and groove come together to help set the router depth for trimming off the back lip of the frame. Problem here is the frame is mitered. I'm thinking I can drill and check or cut ever deeper with router. Advice and what bit to use? Doors are made by Omega. I wouldn't guess they'd glue in the panels but if they did THERE'S a problem.