Amazingly, the walls went up in no time.

The windows were already fitted in the prefabricated walls. All we had to do was to choose where each window panel would be located. There wasn't that much of  a tricky choice; one either side and one at the back seemed the logical way to arrange three windows.

As you can see from the photo, we brought the 'smoke collector' inside the walls at this point on advice of the instructional video. If it didn't end up inside before the last wall was joined, it would have to be lifted over the top to get it where it needed to be!