Ray Gun Ingredients:
Misc. brass pieces from the headboard of an old bed
Brass doorknobs
Misc. brass hardware and rod
Misc. copper pipes and fittings
Leather scraps
Misc wood
Handle from cane
Old belt
Hope it gives you all some inspiration!

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http://blog.makezine.com/archive/2009/01/maker_profile_steampunk_on_make_tel.html
That man is the king of 'misc old metallic crap.' :P