fov, I didn't think the gap issue was too bad finally, but I had to leave a longer bottom part showing otherwise moving up towards the top of the roof, it would have become far too thick and definitely there would have been gaps. I actually did that and had to take about twenty rows off when I noticed what was happening. Fortunately, I used hot glue to put them on so they were easy to take off with a hair blower.
Here's a close up pic of the side of the McKinley where you can see the edges.
http://www.greenleafdollhouses.com/forum/uploads/gallery_34_1124_77476.jpg