22.5" long;
http://home.comcast.net/~mfactory/Biggie_G/Bow_ridge_01.jpg
http://home.comcast.net/~mfactory/Biggie_G...SknsAsy_003.jpg
http://home.comcast.net/~mfactory/Biggie_G...ne_plate_02.jpg
http://home.comcast.net/~mfactory/Biggie_G/Hull_T07.jpg
More here:
http://nugalactica.blogspot.com/
At this scale the vipers would be about 3mm long.