This is a bit interesting and presumably very heavy...  
 
http://cgi.ebay.com/NEW-PRO-6-NECK-GUITAR-AND-BASS-TRIPLE-NECK-DOUBLE-NECK_W0QQitemZ190252728834QQcmdZViewItemQQptZGuitar?hash=item190252728834

........and I think more of a design exercise rather than a practical guitar, unless of course your knuckles drag on the floor when you are standing upright.!!!!

I want to see the case for this guitar(s)!  lol
 
Bill, tgo

Seems a tad pricey for 6 crappy guitars....

I believe this guitar would serve well as a child's headboard. Might also prove to be a good way to capture those middle of the night musical masterpieces.

whoa, I just noticed there are no individual volume controls.  That's some awesome cacophony right there.

OK, don't ask me what kind of insane person would spend their time doing this, but:
 
Using the actual picture as a guide, and assuming fairly standard string spacing of 1.25 for the four string bass, the minimum width that body could be is 26.25. My arm measures 29 from armpit to middle finger tip, and I am usually considered to have long arms. That thing has got to be nearly impossible to play.
 

Is that a red sanitized for your protection stripe I see across the body?
Mike

I guess Rick Nielsen didn't want it.

OK, but why?  I mean, the sextuple-neck is in no way practical, but I can sort of see it as a stage gimmick. This is just silly.
 
Peter