CAD Models

A Japanese reconstruction of the Yen Su type:
 

Mr. Ambrose's version of the Lanchester type:

A Japanese student's work: Well done, Nobuyuki Umetani! (found at www.design.t.u-tokyo.ac.jp/lectures/creative_design_lab/2004/t40172.html)
CAD drawing
The interesting thing on this work is that a
working model was generated by a
"rapid prototyping" process, i.e.built
fully automatically by a laser machine
from liquid resin.
Rapid Prototype

Times do change! Rapid Prototyping is becoming main-stream, and can be tackled by enterprising hobbyists already. Instead of blueprints STL files are published, and if You like a design just "print it" in some solid material.
In October 2011 I was offered a Chariot design, available as "open source" for pick-up at a site called Thingiverse. Not having such a machine (yet?) I was lucky enough to talk the designer into printing me a set in Canada for little money. Tires from the Czech Republic and some scrap metal from my German shop made this model a highlight of my collection.
Well done, Brad!
Spiral Gear Chariot
Spiral Gear Chariot
Spiral Gear Chariot