I also did the Alternative Builds for 6040. This added a small roadside tavern, another wall, and a gate. Not bad.
6040 (blacksmith's shop) was one of the rare sets that actually came with instructions for one of the back of the box builds. From what I can tell...it might be the only one. But, I found instructions for 3 others.
This also gave me a chance to try some new approaches to doing that "castle wall sections" piece that comes up in Castle sets All. The. Time. Mostly, I redid the top feature and how I do the windows. I like these windows MUCH better.