well, it sorta makes a difference. but knowing how you made it was in some ways more important. The fact that it was made in polys and not nurbs has nothing to do with the results you've been getting.

You get your results because of the way you scaled the cube. The cube thinks it is, really, still a cube. There are two ways to fix this. First, you can select "Modify> Freeze transformations" (you really only need scale selected). Second, you can, boolean several elements together (so that all the planks, and most of the door, are one piece). After either one, though, you will need to automap them again. That should solve the problem.... I think.