rip a 36in down to 34in, I've taken 8 in off the bottom of a hollow core door, saved the solid bottom piece, and glued it back into the open bottom. the door looked like it was made that size. for the width, on a solid core, I would take 1" off each side, i think ther's 3 in of solid wood on each side, then particle board for the core. that would leave 2" of solid wood for hinges and lockset. hope this helps