Step 1: design
Special credit to my brother, Marty Coons, for designing the alien spaceship. This is his initial sketch. He's got beautifully wacko designs in his head (here's more of Marty's work), and I'm glad we got to collaborate on this.
Step 2: vacuum forming
Marty made models for the three base shapes out of 20lb foam, and we molded them out of clear plastic. It's funny, as I write this I can smell ghost fumes. The paint is on the inside so they'll be nice and shiny on the outside!
Step 3: assembly
I took my broken boombox apart, and used some of the parts to make the spaceship look more technologically advanced. I wanted the look to contrast with the crafty handmade-ness of the cardboard city and its wax citizens.
Step 5: ANIMATE!
I just shot the first scene with the spaceship in it. Now I'm looking forward to destroying it :)