My fiance and I built this for my seven year old daughter's Christmas present. I have built several pieces of furniture before but this was our first major building project and I'm proud to say we made a great team!
We didn't make any major changes to the plan, we just chose to leave the wheels off the bottom and we added two boards across the back of the attic rooms so we would have something to attach the back too. We were lucky enough that this project coincided with my dad have his roof replaced and he had spare shingles, so her doll house has real asphalt shingles! They were actually a lot easier to add than I expected, we simply scored the back of the shingles with a knife and then they cleanly broke apart. We used a staple gun to attach the shingles we would be able to layer so you couldn't see the staples, but for those where the staples would have shown we used a hot glue gun.
The only issue we had was moving it around without my daughter noticing because it's so big! My fiance and I actually scratched up a door frame trying to sneak it under the tree after she went to sleep because it's so large (totally my fault, apparently I need to work out more). Other than that everything went smooth and it was fun to build and so exciting to watch my daughter freak out over Christmas morning!!!