Really depends on what you are wanting in the way of a guillotine. I built one for the city I work for a couple of years back, since they were'nt to terribly specific on what they wanted, I did a boat load of research and built them the real deal, 13' tall, 30 pd. carriage & blade on rollers, everything works right down to the last detail. The only deviation was an unsharpened aluminum blade (still take your arm off though). I don't have a picture of it, but I liked it so well that I built an exact minature to scale (1" = 1'). Everything on it works as well, table tilts, neck restraint goes up & down, blade works on trigger release (RAZOR sharp steel blade this time). Even the leather strap works, buckle and all. The full sized one the city uses is only operated by a trained employee and civilians just see it on the drive by (it's in a Haunted Trail). If you Google "Guillotine", there is a bit of information out there. Here's a shot of the mini.
Well, it will be finished just in time for the haunt. Its a functional Guillotine that will spew blood when the head is cut off the dummy. I used pretty much scrap wood with a few trips to Menards to tweek some things. The blood will be pumped through a water fountain pump. Im stoked!