To make the doors easier to build in standard dollhouse scales you can print these plans from the pdf (acrobat reader required) files attached here.
The plans have been designed in scale so that you can lay out the parts for your doors and check that they are the right size. All cutting lengths are included on the scale plan. For smaller scale doors I suggest you read the complete instructions and gather materials to make your door. You can adjust the scale by reducing the size of the 1:12 scale door if you want to have a printed layout to build your door on.