I just purchased 8 1930's (I think) solid oak interior doors to replace 1980's hollow slab ugly doors. The length I need to cut the oak doors to is 79.5, they are currently 83.5". The top rail of the oak doors are 4" and there are 3 panels. I would like to cut the top rail of the door instead of splitting the cut between the top and bottom rails since the mortise lockset hardware currently lines up with the existing frame (I would still need to move the hinges). I need advise on how to properly cut down these doors to fit the frames. My thought is too use a jig saw to remove the top rail (4") from the stiles, cut down the hinge and lock stile down to 79.5", remove the panel molding, then cut down the top panel to 75.5", and replace the top rail using gorilla glue. Advice?