Hello. Have got the Ninja V in use since 3 years now, together with the d850 on the "road", doing mostly architecture photography, street - cultural heritage objects, (PC-85 & PCe-19) One thing is really helpful, the monitor zoom option, it brings some more detail to the eyes, and the minotor is always free from the camera, not as static as the on-camera-display. But at home, the ninja display is really to small, and too expensive for that purposes, i would simply use some computer monitor (hdmi) for a perfect preview on screen, well, the camera slows down a little bit, which is not a problem when preparing the object - camera setup. For digitizing old photo prints, negatives, and other printed images. That works very well for me. If you want a perfect image, you really should go to rencay, digital-scanback. It offers +1240 megapixels, world best digital color rendering, not that typical Bayer system. Since you have not any moving objects, it will fit perfectly. You never need to upgrade for a better digital camera anymore, with better sensors every 4-5 years. Since you have got the maximum already, of-course you need a little bit more free time to get one single image. Unknown is, if somebody have already played with digital scanbacks together with stacking. (
https://www.rencay.com/en/rencay-products/products-rencay-scanbacks/)