This is a cool concept, especially for macro work. No more focus stacking
. Very bad ass looking set up as well.
However, the problem is lying in the bellow. Since the distance between the rear element and the sensor is quite far, tilting would definitely reduce significant amount of light hitting the sensor. Since the light path is no longer straight when you tilt, this would create fuzzy image due to the light reflection inside the bellow.
Here is my thought: you should buy a tilt adapter from Arax. Connect the adapter to the bellow setup. So when you tilt, the light path is still straight.