Stacy pointed me off to this story, and even though overall it’s rather cool that they built the thing (not so cool that they were planning on evading regulations and such), out of the entire story, this is the quote I love:
“I understand there is also a cannon.”
Hell, yeah. If you’re going to build a secret castle in the hopes of having no one find it for four years so regulators can’t do anything about it, by all means you should have at least one cannon. Maybe more.