Ollie Baker has started a Kickstarter project to fund his project to develop a 3D-module made of brass to convert a Leica M3 camera to digital by using the sensor of a Sony a7 inside:
I will be placing a digital sensor within the M3 with all the circuitry and electronics it requires to work. The sensor will probably be from the Sony NEX-5 but if I can get enough funding I will try to use the the full frame Sony A7.
I am planning to make two models, one with a the camera’s LCD for viewing photos and adjusting settings, and the other with only an ISO dial.
Basically you will get a digital M with a lever! CAD files will be available for backers with 3D printers. Backers can also opt to receive the brass module. Additional information can be found here.