For those waiting for a Polaroid Back for their RZ67, based on available Polaroid hardware, the wait is almost over. I have received the first shipment of laser cut metal lock rings and currently printing the final version of the adapter top. With a bit of luck, I will have a working prototype this weekend, and will bring it to Polacon NYC for a few lucky people to test.
To reiterate, this will have a dark slide, automatic one button eject, and on off button, and will function on 4 AAA (replaceable) batteries
Stay tuned!