Surprised I haven't seen updates here as I thought there were other backers, but the kickstarter for an M3/A7 conversion, fitting the A7 sensor in an M3 has, finally, updated.
Prototype seems to be working. Some nice detailing. No pix posted as yet. If you're a backer, like me, you get access to the files for 3D printing... but then it will get a bit complicated I guess!