A few things to start your month off right!
Paul of Paul’s Bods has a rather clever nearly-math-free method of getting a perfectly fitting roofs. It would need a bit of adaption to work with the removable roofs I usually give my structures, but not much!
I’ve also just discovered the Flickr account of the San Diego Air & Space Museum Archives, which is full of all sorts of great interwar aviation imagery!
The famous zeppelin USS Los Angeles:
…and this fantastically pulpy looking volcanic island, with (unfortunately) no location information. I’m absolutely certain that steaming caldera houses a Mad Scientist’s Secret Headquarters or a Lost World, however!
The San Diego Air & Space Museum Archive’s Flickr account is all part of the fantastic Flickr Commons scheme, which has great museums, libraries and archives from all over the world putting their material on Flickr with no known copyright restrictions.