+Fanatical (David Hewlett)
The one I had through a goodly portion of early high school was HO. In recent years, I've found myself more drawn to N gauge for some reason. Unfortunately, I don't live anywhere that I would be able to construct a set. Perhaps....some day.
Homemade explosives? Far beyond my most wild designs for my set. The most intensive thing I obsessed over was trying to get the pond beside the post office to look like more than a mirror I'd glued to the underside of a hole I'd cut in the table. The trees around it were lovely, though!