After hunting around for some footage of it in action, it looks like you're going to end up with lots of improperly exposed images and a clunky UI. It is going to be far more practical to simply buy a Sony A7 type mirrorless body and some lens adapters to shoot with histogram view, for 35mm at least. Digital medium format back is another story entirely perhaps more suited to this scenario.
The precision to align the sensor doesn’t appear to be present. In any case, the camera body isn’t where the magic is, and old lenses can be fitted to new bodies in a crazy number of permutations these days. I only today picked up a Contax Zeiss 300 f4. It fits on my Canon now. I love my Contax but the cost of this sensor this would likely pay for a lot of film and processing. Let’s see when it launches.