Thats not my setup, but I have working 911 e-brakes in my 914. I have send some pics here somewhere.
The link and the pages are interesting. Very good pics. Most interesting part is in the middle of the page. I suppose he is American, but there is that you have to fabricate
40mm wide spacer between brake shoes. Why this is in millimeters.... Have he seen Eric´s thread and my picture there
The idea of using original 914 cables, the bellcranks and short custom cables is good, but the brake shoe mechanism there is not working like it is planned. It may work, but not like in 911s. The cable cover in 911s pull the mechanism.