"It is a metal door but i have some wood on the sides to work with." There you go, as the previous post stated, you do have some wood to plane down. I suggest taking an equal amount from both sides of the door to start with, test fit it, and if needed take equal amounts off both sides again. Making sure the hinges are set flush is critical also. An old fashion carpenter's rule would be the trick for this one, the type with the sliding rule in the end, ( I still have my Granddad's) or if you can come up with two pieces of wood and a small c-clamp. Place the two pieces of wood between the door jamb, level, so that they overlap, clamp together snugly. Lay this measurement on the door, subtract 1/8", and you will know exactly what dimension the door needs to be. "Proud Marine Dad, Huh"? No doubt you can do it if you raised your son to be a Marine. Good Luck, David