I decided to put an opening for a stair from the third floor to the attic. To make sure the stair opening was exactly over the floor opening below, I made a template of the third floor (the wall is not up on the third floor) and transposed it to the attic floor. I will attempt to put up the third floor wall by the stairs tomorrow and I will know if this is all correct. RGT were great about sending me another stair and railing-it did not cost too much. I am waiting for a roof piece from RGT in VT. to get the front finished-then I can put the house in a permanent place, hook up the transformers, install lights and molding-----then, ta da, put in the furniture.
To cut the hole I used this tool from Harbor Freight. It is a oscillating thing that has 5 blades-it was about $30. The noise was terrible-I had to get ear plugs. I have seen this tool other places for $100+++. It is good for dollhouse use.