Just finished up a scratchbuilt belt circuit for my Ghostbusters costume:
For those that don't know these were originally circuit boards out of a 70's calculator that are now impossible to find. They're in a "holster" on a GB's belt to tech it up a bit in the movie. More pics and a build log are on my website here: http://www.angelfire.com/pa5/jdoud/gbbeltcirc.html
Still have to make the holster and daughter board but I'm glad to have the main part done.