"I wanted to own a coding machine, and now I do."
Tatjana J. van Vark is a scientist, artist and polymath who, despite having no formal training in electronics or mechanical engineering, built her own oscilloscope at the age of 14, the Cryptograph which you see above, and dozens of other fascinating machines and instruments. Here is an extensive biography, if you would like to know more about her life and background.
Her Cryptograph is not an Enigma machine, but is based on similar principles. Notable improvements include a printer, a Baudot code tape printer and reader, alphanumeric rotors, a rotor (the one with numerals only) which I’m guessing might be used as in a Lorenz machine to pseudo-randomly vary the rotation speeds of the other three rotors, a super encipherment device which I believe functions similarly to the plugboard on an Enigma, a code converter and a few other items whose functions are a complete mystery to me.
To understand the scale of this project, note that each one of the four rotors in her machine contains 509 parts. She designed and fabricated almost every part, right down to formulating her own varnish. It reportedly took eight months of work, over the course of several years.
Sources: tatjavanvark.nl, Craftsmanship Museum, Enigma Museum