Artist "Jacob P" has created an impressive retro-tech genetic engineering kit .
This is the only "kit-style" prop project I've seen that manages to be both disturbing and funny at the same time. Browse through the rest of his blog and you'll find some amazing work, ranging from mounted fairy heads to a beautiful neo-victorian* blaster.
*I can't bring myself to call what he does "steampunk", since it's actually, you know, good . For every genuine artist like Tom Banwell or Datamancer lovingly crafting retro-tech devices there are two dozen hacks slapping together brass-colored junk from the goodwill store and calling it "steampunk". By sheer force of numbers the hacks won, effectively redefining the term into a label of derision.
Yes, now that you ask, I am a cranky old man. Heh.