Clauss pano picture copying at AssisiPano heads have their uses, and I am thinking about getting a Clauss, but in this instance they seem to have got everything wrong:
They use a DSLR with focal plane shutter, mirror and Anti-Aliasing filter...
... and not a High-res AA-free, mirror-free professional MFD camera with an electronic shutter.
They even use a low-res Nikon D2X for one picture, but, if you combine enough images, you can get as much res as you want.
They use a lens designed for sport or wildlife work, not copying.
For recti-linear work they use a polar/pano system...
creating perspective distortion that will have to be rectified in software, resulting in further loss of resolution.
A Cartesian rectilinear system, keeping the sensor parallel to the picture ¿zig-align? would prevent this distortion... a normal "move and stitch" system easily achieved with a Cartesian robot (rather than a polar/pano/rotating one).
Moving the lights with the camera might have some benefit... but generally, when copying paintings, you need to keep the light well away from the camera (especially when copying oil paintings)... but, you might get away with it for matt art work.
If you wanted to study the brushwork of Leonardo, you would need oblique light, so, while you were doing the job, you should take two sets of pictures, one showing the brushwork, and one for the picture.
Their set-up picture shows perspective distortion, visible in the back wall, which makes the arches look asymmetrical.
The Italians (and Germans) are generally fully up to speed with technology as well as art.