Up for sale is my EUB aka "Thing".  It's a 1950's double bass neck grafted onto a stainless steel frame (actually the neck has some lovely flaming of the grain) . It has a standard 41.5" double bass string length and an old Schaller magnetic pickup (fully adjustable) proper bridge and nut. People have described the sound as an angry P bass(!). Obviously it can't be bowed but all the ergonomics and dimensions have been copied from my 200yr old "real" double bass.  The frame is stainless