Friend of mine asked if he could borrow my router, because he needed to replace a door in his house. House is recent construction, doors are hollow core "six panel" doors apparently made of pressed poop and fail. He bought a similar door (from HD) the same nominal size and just wanted to rout the mortises for the hinges, because being mass produced prehung doors they used radius-corner hinges.
The old door measured 29-7/8" wide. The new door (Jeld-Wen) brand measured almost 30-1/4" wide. FAIL FAIL FAIL. Of course I didn't have a plane in the trunk of my car.
On the upside, while the old busted door appeared to have the outside frame made of MDF, the new Jeld-Wen door, despite having the same flimsy (understatement of century) facing, used real pine for the structure.
I personally would have been tempted to spend the $$ and buy a real solid pine paneled door, but then the doors in the rest of the house would have looked like shit in comparison...
nate